An efficient, stereoselective synthesis of 4-E- and 4-Z-d-erythro-sphingenine and related compounds from 2-amino-2-deoxy-d-glucose
作者:Tamio Sugawara、Masayuki Narisada
DOI:10.1016/0008-6215(89)85012-8
日期:1989.12
Efficient, stereoselective synthesis of 4-E- and 4-Z-D-erythro-sphingenines having C16, C18, and C20 carbon-chains was achieved in 13 steps, starting from allyl 2-benzyloxycarbonylamino-2-deoxy-alpha-D-glucopyranoside. 2-Amino-1,6-di-O-tert- butyldiphenylsilyl-2-N,3-O-carbonyl-2-deoxy-D -allitol was used as the key intermediate.
2,4-Di-O-protected D-threose, readily available from D-galactose, is a versatile intermediate for D-erythro-ephingosine syntheses via trans-selective Wittig reaction, azide introduction at the unprotected hydroxylic group, and subsequent azide reduction.
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.
Stereochemistry associated with the addition of 2-(trimethylsilyl)thiazole to differentially protected .alpha.-amino aldehydes. Applications toward the synthesis of amino sugars and sphingosines