A Versatile Approach to <i>N</i>-Boc-statine and <i>N</i>-Boc-norstatine Based on the Reduction of 1-Trialkylsilyl Acetylenic Ketones. Strong Remote Effect of the C(1) Substituent on the Stereoselectivity
[GRAPHICS]An efficient, unified approach to chiral, protected beta-hydroxy gamma-amino and alpha-hydroxy beta-amino acids derived from Boc-L-leucine has been accomplished on the basis of the oxazaborolidine-controlled, stereoselective reduction of 1-trialkylsilyl acetylenic ketones; stereoselectivity in the reduction step has shown strong dependence upon C(1) substitution.
KANO, SHINZO;YOKOMATSU, TSUTOMU;IWASAWA, HARUO;SHIBUYA, SHIROSHI, CHEM. AND PHARM. BULL., 36,(1988) N 9, C. 3296-3303