Stereoselective mono- and bis-homologation of L-serinal via 2-trimethylsilylthiazole addition. The thiazole route to amino L-sugars and D-erythro-sphingosines
作者:Alessandro Dondoni、Giancarlo Fantin、Marco Fogagnolo、Alessandro Medici
DOI:10.1039/c39880000010
日期:——
anti-Addition [92% diastereoselectivity (d.s.)] of 2-trimethylsilylthiazole (2) to O,N-protected L-serinal (1) and deblocking the formyl group in the resulting adduct, leads to the (2S,3S)-2,4-dihydroxy-3-aminobutanal derivative (7), which serves as a precursor both to masked 4-amino-4-deoxy-L-ribose/L-arabinose and D-erythro-C20-sphingosine.
2-三甲基甲硅烷基噻唑(2)对O,N保护的L-丝氨酸(1)的抗加成[92%非对映选择性(ds)]和使所得加合物中的甲酰基解封,导致(2 S,3 S) -2,4-二羟基-3-氨基丁醛衍生物(7),其用作前体既掩蔽4-氨基-4-脱氧大号核糖/大号-arabinose和d -赤-C 20 -sphingosine。