C-Glycosyl-(S)- and (R)-alanines 12a and 12b were synthesized from the known β-C-glycoside 1. The nitrogen function was introduced by aza-Claisen rearrangement of the allylic thiocyanate 7, derived from the corresponding alcohol 6. The absolute configuration of the newly created chiral carbon center (C-3) was assigned by X-ray diffraction analysis of the intermediate 3(S)-isothiocyanato-D-glycero-D-galacto-decose 8a.
C-糖基-(S)-和(R)-丙
氨酸 12a 和 12b 是由已知的 β-C 糖苷 1 合成的。氮功能是通过烯丙基
硫氰酸盐 7 的氮-克莱森重排引入的,而烯丙基
硫氰酸盐 7 是由相应的醇 6 生成的。通过对中间体 3(S)-isothiocyanato-D-glycero-D-galacto-decose 8a 进行 X 射线衍射分析,确定了新生成的手性碳中心(C-3)的绝对构型。