AbstractA synthesis of racemic thalidomide (1) was described and the important formal [3+3] cycloaddition strategy was a keystep. The total yield of thalidomide (1) was 18% in five steps from known 3.
[reaction: see text] The reaction of alpha-sulfonyl acetamide 1 with various cyclic unsaturated esters 2 to fused bicyclic glutarimides is reported. Syntheses of (+/-)-alloyohimbane (4) and louisianin D (5) have been accomplished.
Efficient Synthesis of 4,5-Disubstituted-3-Toluenesulfonyl Glutarimides. Application to the Formal Synthesis of Mappicine Ketone
作者:Yung-Sheng Wang、Nein-Chen Chang、Ching-Han Lin、Huo-Mu Tai
DOI:10.1002/jccs.200800064
日期:2008.4
Various 4,5-disubstituted-3-sulfonyl glutarimides 3 were synthesized from α-sulfonyl acetamide 1 and ethyl α,β-disubstituted acrylate esters 2 via stepwise facile [3+3] annulation in moderate yield. The synthesis of pyridin-2-one 9, a key intermediate for mappicineketone (4) synthesis, was also reported.
Abstract A synthesis of racemic thalidomide is described using formal [3+3] cycloaddition strategy as the key step. The total yield of thalidomide was 30% in three steps from ester 2.
Regioselective Reduction of 3-Sulfonyl Glutarimides to 3,4-Dihydro-5-sulfonylpyridin-2-ones. Formal Synthesis of the Indolizidine 8a-<i>e</i><i>pi</i>-Dendroprimine
作者:Ru-Ting Hsu、Li-Ming Cheng、Nein-Chen Chang、Huo-Mu Tai
DOI:10.1021/jo025539p
日期:2002.7.1
Sodium borohydride regioselectively reduced various 3-sulfonyl glutarimides 1 to hydroxy piperidones 2, which were further dehydrated to 3,4-dihydro-5-sulfonylpyridin-2-ones 3 in the presence of boron trifluoride. Formal synthesis of 8a-epi-dendroprimine (4) possessing an indolizidine ring system has been accomplished via intramolecular radical cyclization of cyclic vinyl sulfone 5.