摘要:
A process for producing a fluorine-containing 2,4-diol represented by the formula [4], wherein R1 represents a hydrogen atom or an acyclic or cyclic alkyl group having a carbon atom number of 1 to 7; R2 represents an acyclic or cyclic alkyl group having a carbon atom number of 1 to 7, a phenyl group, or a substituted phenyl group; and R1 and R2 are optionally bonded to each other to form a ring, includes reducing a hydroxy ketone represented by the formula [3], wherein R1 and R2 are defined as above, by hydrogen in the presence of a ruthenium catalyst.
摘要翻译:由式[4]表示的含氟2,4-二醇的制造方法,其中R 1表示氢原子或碳原子数为1〜10的无环或环状烷基 7; R 2表示碳原子数为1〜7的无环或环状的烷基,苯基或取代的苯基; R 1和R 2可任选地彼此键合形成环,包括还原由式[3]表示的羟基酮,其中R 1 R 2和R 2如上定义,在钌催化剂存在下用氢气。
摘要:
The present invention provides a process for producing an optically active β-trifluoromethyl-β-hydroxycarbonyl compound represented by formula (3): comprising a step of reacting a fluoral equivalent represented by formula (1): with a carbonyl compound represented by formula (2): in the presence of an optically active amino acid or a derivative thereof.
摘要:
A process for producing an .alpha.-hydroxyketone represented by formula (I): ##STR1## wherein R.sup.1 represents a substituted or unsubstituted alkyl group, a substituted or unsubstituted aralkyl group, or an alkoxycarbonyl group; and R.sup.2 and R.sup.3 each represent a hydrogen atom, a substituted or unsubstituted alkyl group, or a substituted or unsubstituted aralkyl group, provided that they do not simultaneously represent a hydrogen atom; or a pair of R.sup.1 and R.sup.2, a pair of R.sup.1 and R.sup.3, or a pair of R.sup.2 and R.sup.3 is taken together to form a ring; and the pair of R.sup.1 and R.sup.2 and the pair of R.sup.2 and R.sup.3 may form a ring simultaneously, is disclosed, comprising reacting a compound represented by formula (II): ##STR2## wherein R.sup.1, R.sup.2, and R.sup.3 are as defined above, with an oxidizing agent in the presence of a ruthenium compound and water. .alpha.-Hydroxyketones useful as physiologically active substances are produced with good selectivity and in high yield.
摘要:
A process for preparing oxocyclopentenes of the formula: ##STR1## wherein R.sup.1 is hydrogen, lower alkyl or lower alkenyl and R.sup.2 is hydrogen, lower alkyl, lower alkenyl, lower alkynyl, substituted or unsubstituted aryl, ar(lower)alkyl, thienyl or cycloalkyl, which comprises subjecting a furan-carbinol of the formula: ##STR2## wherein R.sup.1 is as defined above and R.sup.3 is hydrogen, lower alkyl, lower alkenyl, lower alkynyl, substituted or unsubstituted aryl, ar(lower)alkyl, thienyl or cycloalkyl to rearrangement, subjecting the resultant hydroxycyclopentenone of the formula: ##STR3## wherein R.sup.1 and R.sup.3 are each as defined above to hydrogenation and subjecting the resulting hydroxycyclopentanone of the formula; ##STR4## wherein R.sup.1 and R.sup.2 are each as defined above to dehydration.
摘要:
Potent tumor inhibitors are prepared which are compounds of the formula: ##STR1## wherein Q is CO, CH(OH) or C(OH)CH.sub.3,M.sub.1 is halogen,M.sub.2 is halogen or hydrogen,c is one or twop is 0 or 1, andone of X and X' is H and the other is hydroxy-C.sup.2-9 alkyl, methoxy-C.sup.2-9 -alkyl, ethoxy-C.sup.2-9 -alkyl, oxo-C.sup.2-9 -alkyl, formyl-C.sup.2-9 -alkyl, carboxy-C.sup.2-9 -alkyl or (C.sub.1-2 -alkyl)oxycarbonyl-C.sup.2-9 -alkyl.
摘要:
The present invention relates to substituted cyclopentanone and cyclohexanone derivatives and substituted cyclopentenone and cyclohexenone derivatives, which are useful as intermediates for pharmaceutical products and agricultural chemicals and especially useful for the synthesis of prostaglandins, and also to a process for producing the same.
摘要:
A compound of the formula ##STR1## wherein Q is CO, CH(OR), CR(OH), or CR (OC)-lower alkyl); R is H, or C.sup.1-2 -alkyl;X is hydroxyalkyl,methoxy-C.sup.2-11 -alkyl, ethoxy-C.sup.2-11 -alkyl or oxo-C.sup.2-11 -alkyl, formyl-C.sup.2-11 -alkyl,carboxy-C.sup.2-11 -alkyl or (C.sub.1-2 -alkyl) oxycarbonyl-C.sup.2-11 -alkyl;c is 1 or 2;p or w are 0, 1 or 2 and the sum of p and w is 1 to 4;and a pharmaceutically acceptable salt thereof.
摘要:
Compounds of the formulae Ia, Ib, IIa and IIb ##STR1## are described, wherein R represents alkyl, haloalkyl, benzyl, naphthyl or substituted or unsubstituted phenyl and one of R.sub.1 and R.sub.2 represents methyl and the other represents hydrogen or methyl, or R.sub.1 and R.sub.2 together represent alkylene of 2 or 3 carbon atoms. The compound of the formulae Ia, Ib, IIa and IIb are valuable intermediates for the manufacture of pyrethroid pesticides or precursors thereof.
摘要:
Optically active organic compounds are prepared starting from optically inactive reactants by means of an optically active agent which influences the course of the reaction. In particular optically active compounds having a "meso" type carbon atom undergo an intramolecular ring closure in the presence of an optically active agent to yield an optically active product having one additional ring. The present process is particularly useful in the preparation of optically active bicyclic diketones which are important intermediates in the total synthesis of steroids.