Regioselective Sulfonylation and <i>N</i>- to <i>O</i>-Sulfonyl Migration of Quinazolin-4(3<i>H</i>)-ones and Analogous Thienopyrimidin-4(3<i>H</i>)-ones
作者:Matthias D. Mertens、Markus Pietsch、Gregor Schnakenburg、Michael Gütschow
DOI:10.1021/jo4010876
日期:2013.9.20
The sulfonylation of quinazolin-4(3H)-ones and related tetrahydrobenzothieno[2,3-d]pyrimidin-4(3H)-ones with mesyl, tosyl, and p-cyanobenzenesulfonyl chloride was studied. A hydrogen substituent at 2-position directed the sulfonyl group to the N-3 position, while alkylsulfanyl or amino substituents led to sulfonylation of the carbonyl oxygen. The latter effect was attributed to steric influence and
研究了喹唑啉-4(3 H)-酮和相关的四氢苯并噻吩并[2,3 - d ]嘧啶-4(3 H)-与磺酰基,甲苯磺酰基和对氰基苯磺酰氯的磺酰化反应。在2-位的氢取代基将磺酰基引导至N-3位,而烷基硫烷基或氨基取代基导致羰基氧的磺酰化。后者的作用归因于空间影响和2-取代基的正消旋作用。建立了N-磺酰化的2-取代的区域异构体的途径。观察到意外的1,3-磺酰基迁移并进一步分析。此过程发生在分子内N-到O如动力学和交叉实验所证实的-移位。