Thiocarbonyl ylides. Photogeneration, rearrangement, and cycloaddition reactions

Thiocarbonyl ylides. Photogeneration, rearrangement, and cycloaddition reactions
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硫代羰基叶立德。

DOI:
10.1021/ja00428a029
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发表时间:
1974
期刊:
影响因子:
--
通讯作者:
M. DeTar
M. DeTar
中科院分区:
--
文献类型:
--
作者:
A. Schultz;M. DeTar

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相似文献

萘基乙烯基硫醚8-13进行区域特异性光环化成硫代羰基叶立德。这些反应性中间体重排为[2,1 -6]二氢噻吩14,21,22,24,25和26,并环加成到N-苯基马来酰亚胺上,以高产率得到多环加合物(例如,16 a,16 b和23)。8向21的转化已被证明是通过8向硫代羰基叶立德29的顺旋光环化而发生的(通过加合物23的分离和X射线分析确定的立体化学);随后在29中的超表面氢迁移得到高度应变的反式稠合二氢噻吩21。
Naphthyl vinyl sulfides 8-13 undergo regiospecific photocyclization to thiocarbonyl ylides. These reactive intermediates rearrange to [2, l-6] dihydrothiophenes 14, 21, 22, 24, 25, and 26, andcycloadd to N-phenylmaleimide to give multicyclic adducts in high yield (eg, 16a, 16b, and 23). Conversion of 8 to 21 has been shown to occur by conrotatory photocycliza-tion of 8 to thiocarbonyl ylide 29 (stereochemistry determined by isolation and x-ray analysis of adduct 23); subsequent supra-facial hydrogen migration in 29 gives highly strained trans-fused dihydrothiophene 21.