The Development of a Sulfamate-Tethered Aza-Michael Cyclization Allows for the Preparation of (−)-Negamycin <i>tert</i>-Butyl Ester
作者:Harshit Joshi、Appasaheb K. Nirpal、Debobrata Paul、Steven P. Kelley、Joel T. Mague、Shyam Sathyamoorthi
DOI:10.1021/acs.joc.4c00604
日期:2024.4.19
We present the first examples of intramolecular aza-Michael cyclizations of sulfamates and sulfamides onto pendant α,β-unsaturated esters, thioesters, amides, and nitriles. Stirring the substrate with catalytic quantities of the appropriate base delivers the product in good yield and excellent diastereoselectivity. The reactions are operationally simple, can be performed open to air, and are tolerant
我们提出了氨基磺酸盐和磺酰胺在α,β-不饱和酯、硫酯、酰胺和腈侧链上的分子内氮杂迈克尔环化的第一个例子。用催化量的适当碱搅拌底物,可以得到良好产率和优异的非对映选择性的产物。该反应操作简单,可以在空气中进行,并且能够耐受多种重要的官能团。我们通过将其用于制备 (−)-negamycin 衍生物来强调该技术的实用性。