Regio- and Diastereoselective Access to 4-Imidazolidinones via an Aza-Mannich Initiated Cyclization of Sulfamate-Derived Cyclic Imines with α-Halo Hydroxamates
An efficient regio- and diastereoselective cyclization of sulfamate-derived cyclic imines with unsubstituted or monosubstituted α-halo hydroxamates is developed under mild conditions. This reaction proceeds smoothly under transition-metal-free conditions via a domino aza-Mannich addition/intramolecular nucleophilic substitution sequence, providing a convenient route to access 2-monosubstituted and
A facile access to thiazolidin-4-ones from α-enolic dithioesters and α-halohydroxamates in situ derived active 1,3-dipolar aza-oxyallyl cations was achieved under mild conditions.
Mapping Ambiphile Reactivity Trends in the
<i>Anti</i>
‐(Hetero)annulation of Non‐Conjugated Alkenes via Pd
<sup>II</sup>
/Pd
<sup>IV</sup>
Catalysis
作者:Hui‐Qi Ni、Phillippa Cooper、Shouliang Yang、Fen Wang、Neal Sach、Pranali G. Bedekar、Joyann S. Donaldson、Michelle Tran‐Dubé、Indrawan J. McAlpine、Keary M. Engle
DOI:10.1002/anie.202114346
日期:2022.3.21
from non-conjugated alkenyl amides and ambiphilic organohalides is described. Under PdII/PdIV catalysis, this [n+2] annulation proceeds in an anti-selective fashion and tolerates a wide array of ambiphiles, which are systematically benchmarked with respect to nucleophile identity, electrophile identity, and product ring-size. Otherwise unreactive ambiphilic ortho-haloacetophenones can be activated
描述了从非共轭烯基酰胺和两亲性有机卤化物获得 5、6 和 7 元碳环和杂环的方法。在 Pd II /Pd IV催化下,这种 [ n +2] 环化以反选择性方式进行,并耐受多种双亲剂,这些双亲剂在亲核体特性、亲电子体特性和产物环大小方面进行了系统的基准测试。另外,非反应性两亲性邻卤代苯乙酮可以使用胺助催化剂来活化。
[3 + 3] Cycloaddition of aza-oxyallyl cations with 1,4-dithiane-2,5-diols for the construction of 3-thiomorpholinones
Abstract Base-mediated [3 + 3] cycloadditionreaction of in-situ formed aza-oxyallyl cations and 1,4-dithiane-2,5-diols has been achieved under mild reaction conditions. This strategy provides direct and efficient access to prepare desired thiomorpholin-3-one derivatives in moderate-to-high yields. The approach features broad substrates scope and short reaction time. Moreover, the resulting products