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(2R,5S)-2-Hydroxymethyl-1-carbapenam (3), the carba-analog of an antifungal beta-lactam (2R,5S)-2-(hydroxymethyl)calvam (1), was synthesized in an enantiocontrolled manner, starting from the coupling reaction of an optically active phthalimido-acetate (3S,4S)-4 and an allylsilane 7, followed by removal of the phthalimido group that was crucial for asymmetric induction. Hydroboration, protecting-group interconversion, and cyclization gave 3 stereoselectively.

.BETA.-Lactam Antifungals. II. Enantiocontrolled Synthesis of (2R,5S)-2-Hydroxymethyl-1-carbapenam, the Carba-Analog of a Clavam Antifungal.