Lewis-acid promoted addition of 2-trimethylsilyloxyfuran to nitrones: Synthesis and absolute configuration of tetrahydro-2-benzyl-3-(1-benzyloxyethyl)-furo[2,3-d]isoxazol-5(2H)ones
摘要:
A straightforward synthesis of tetrahydro-2-benzyl-3-(1-benzyloxyethyl)-furo [2,3-d]isoxazol-5(2H)ones is reported, based on the Lewis acid-catalysed addition of 2-trimethylsilyloxyfuran to the N-benzyl nitrone of (S)-lactaldehyde. Copyright (C) 1996 Elsevier Science Ltd
Lewis-acid promoted addition of 2-trimethylsilyloxyfuran to nitrones: Synthesis and absolute configuration of tetrahydro-2-benzyl-3-(1-benzyloxyethyl)-furo[2,3-d]isoxazol-5(2H)ones
摘要:
A straightforward synthesis of tetrahydro-2-benzyl-3-(1-benzyloxyethyl)-furo [2,3-d]isoxazol-5(2H)ones is reported, based on the Lewis acid-catalysed addition of 2-trimethylsilyloxyfuran to the N-benzyl nitrone of (S)-lactaldehyde. Copyright (C) 1996 Elsevier Science Ltd
Regio- and stereoselective synthesis of isoxazolidine derivatives by asymmetric 1,3-dipolar cycloaddition reaction of chiral nitrones with 1-propene-1,3-sultone
作者:Hong-Kui Zhang、Wing-Hong Chan、Albert W. M. Leeb、Wai-Yeung Wong
DOI:10.1002/jhet.5570450402
日期:2008.7
Asymmetric 1,3-dipolar cycloadditions of chiral nitrones to 1-propene-1,3-sultone (1) were investigated. Chiral nitrones 6a-e reacted with sultone 1 in toluene at 90 °C for 24-36 h to give the corresponding isoxazolidines in moderate yields with high regioselectivities and stereoselectivities. The diastereoselectivity of this reaction varied with the choice of dipolarophile and the steric demands of