trimethylsilylmethyl isothiocyanate with aldehydes or ketones afforded oxazolidine-2-thione derivatives, which involves the isothiocyanato carbanion as an intermediate. Imidazolidine-2-thiones were similarly prepared from imines. The reaction of bis(trimethylsilyl)methyl isothiocyanate with benzaldehyde in the presence of a catalytic amount of n-Bu4NF gave styryl isothiocyanate and 5-phenyl-4-trimethylsilyloxazolidine-2-thione
METHOD FOR PRODUCING 1,4-DIPHENYL AZETIDINONE DERIVATIVES
申请人:LINDENSCHMIDT Andreas
公开号:US20070149776A1
公开(公告)日:2007-06-28
The present invention is directed to the preparation of novel compounds useful in the treatment of hyperlipidemia, arteriosclerosis, hypercholesterolemia, and other related metabolic disorders. More specifically, the present invention is a novel process for the preparation of 1,4-diphenylazetidinone derivatives from β-substituted amino amides which are protected in the presence of silylating agents and at least one cyclization catalyst whose structural formula is represented by one of the general formula:
Wherein the various R-groups are defined herein