Ketene silyl acetal chemistry; diastereofacial selectivity of 1,3-addition of chiral nitrones
作者:Yasuyuki Kita、Osamu Tamura、Fumio Itoh、Hiroko Kishino、Takashi Miki、Masako Kohno、Yasumitsu Tamura
DOI:10.1039/c39880000761
日期:——
The reaction of dimethyl-t-butylsiloxy-1-methoxyethene (1a) with the N-benzylnitrone (3a) produced the syn-1,3-adduct (4a) predominantly, while the reaction of dimethyl-t-butylsiloxy-1-t-butoxyethene (1b) with the N-diphenylmethylnitrone (3d) gave the anti-1,3-adduct (4h) predominantly; both adducts were readily transformed into the corresponding 3-benzoylamino-2,3-dideoxypentoses (8a,b) in fair yields
二甲基叔丁基甲硅烷氧基-1-甲氧基乙烯(1a)与N-苄基硝基(3a)的反应主要产生合成-1,3-加合物(4a),而二甲基叔丁基甲硅烷氧基-1-t的反应-丁氧基乙烯(1b)与N-二苯基甲基硝基(3d)主要产生抗-1,3-加合物(4h);两种加合物都容易以合理的产率转化为相应的3-苯甲酰基氨基-2,3-二脱氧戊糖(8a,b)。