Facile Access to Bicyclic Sultams with Methyl 1-Sulfonylcyclopropane-1-carboxylate Moieties
作者:Valentin A. Rassadin、Aleksandr A. Tomashevskiy、Viktor V. Sokolov、Arne Ringe、Jörg Magull、Armin de Meijere
DOI:10.1002/ejoc.200900113
日期:2009.6
4-dibromobutyl)(methoxycarbonyl)methanesulfanilides upon treatment with potassium carbonate in DMF furnish methyl 3-aryl-2,2-dioxo-2-thia-3-azabicyclo[n.1.0]alkane-1-carboxylates in yields ranging from 54 to 84 % (10 examples). The starting materials were obtained by sulfonylation of N-alkenylanilines with methyl (chlorosulfonyl)acetate and subsequent bromination. For the N-alkenylanilines (10 examples, 60–77 %
N-(2,3-二溴丙基)-和 N-(3,4-二溴丁基)(甲氧基羰基)甲磺酰苯胺在 DMF 中用碳酸钾处理后得到甲基 3-芳基-2,2-二氧-2-硫杂-3-氮杂双环[n.1.0] 烷烃-1-羧酸盐的产率范围为 54% 至 84%(10 个实例)。通过用(氯磺酰基)乙酸甲酯磺酰化N-链烯基苯胺并随后溴化来获得起始材料。对于 N-烯基苯胺(10 个实例,60-77% 的产率),已经开发出一种采用 2-硝基苯磺酰基取代基作为保护基团和活化基团的高效新合成方法。通过用硝酸铈 (IV) 铵处理,可以很容易地从 sultam 氮原子上去除 4-甲氧基苯基 (PMP) 基团。 (© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2009)