Intermediates in the preparation of chiral hydantoins
申请人:Pfizer Inc.
公开号:US04348526A1
公开(公告)日:1982-09-07
A novel process for the synthesis of chiral hydantoins of the structure ##STR1## wherein X is fluoro or chloro, from the corresponding 6-halo-4-chromanone of the structure ##STR2## is described. The compounds I are valuable in the treatment of certain chronic complications arising from diabetes mellitus. In addition the compound of the formula I wherein X is chloro possesses complementary hypoglycemic activity. The process comprises the sequence of dehydrative coupling of the halochromanone (II) with S-(-)-alpha-methylbenzylamine to form the imine of structure ##STR3## addition of hydrogen cyanide to form the nitrile of structure ##STR4## condensation with chlorosulfonylisocyanate (or its equivalent) to form the alpha-methylbenzylhydantoin of structure ##STR5## and finally solvolysis of the latter to the chiral hydantoin of structure I.
A novel process for the synthesis of chiral hydantoins of the structure ##STR1## wherein X is fluoro or chloro, from the corresponding 6-halo-4-chromanone of the structure ##STR2## is described. The compounds I are valuable in the treatment of certain chronic complications arising from diabetes mellitus. In addition the compound of the formula I wherein X is chloro possesses complementary hypoglycemic activity. The process comprises the sequence of dehydrative coupling of the halochromanone (II) with S-(-)-alpha-methylbenzylamine to form the imine of structure ##STR3## addition of hydrogen cyanide to form the nitrile of structure ##STR4## condensation with chlorosulfonylisocyanate (or its equivalent) to form the alpha-methylbenzylhydantoin of structure ##STR5## and finally solvolysis of the latter to the chiral hydantoin of structure I.
Intermediates useful in the preparation of certain chiral hydantoins, including sorbinil
申请人:PFIZER INC.
公开号:EP0145895A1
公开(公告)日:1985-06-26
Hydantoin intermediates of the formulae:
and
where X is chloro or fluoro.
These intermediates are useful in preparing certain chiral hydantoins, including, when X = F, sorbinil, as described in European patent application publication no. 0037672.
式的海因中间体:
和
其中 X 为氯或氟。
这些中间体可用于制备某些手性海因,包括 X = F 时的山梨醇,如欧洲专利申请公布号 0037672 所述。
SARGES, R.;HOWARD, H. R. ,, JR;KELBAUGH, P. R., J. ORG. CHEM., 1982, 47, N 21, 4081-4085
作者:SARGES, R.、HOWARD, H. R. ,, JR、KELBAUGH, P. R.
DOI:——
日期:——
Process for the preparation of chiral hydantoins, and a novel hydantoin produced by said process and a pharmaceutical composition containing it