N-磺酰基酮亚胺与2-芳酰基-1-氯环丙烷羧酸酯的底物控制的多米诺反应:进入环戊[ c ]色烯和苯并[ f ]环戊[ d ] [1,2]硫氮平二氧化物
摘要:
报道了一种空前的底物控制的成环方法,该方法可合成出令人着迷的有角度的稠合环戊达[ c ]色烯和苯并[ f ]环戊[ d ] [1,2]噻嗪类5,5-二氧化物衍生物,化学产率高至高。 。这种由迈克尔引发的扩环反应将通过明智地选择亲碳亲核分子(4-烷基或3-烷基取代的N)来实现两个CC和一个OC或CN键。-磺酰酮亚胺,分别与一系列供体-受体环丙烷支架作为DBU促进的4C来源。而且,这种环保方法足够温和,可以保护各种功能。重要的是,通过简单的催化氢化反应,可以将制备的熔融富烯骨架顺利地转化为一类特殊的六氢环戊并[ c ]色烯,以优异的收率成为单一的顺式–顺式–顺式–顺式非对映异构体。
描述了2-酰基-1-氯环丙烷甲酸酯与胺的碱促进的多米诺反应。在无机碱如Cs 2 CO 3或Mg(OEt)2的存在下,反应在乙腈中顺利进行,以适中至优异的收率(最高97%)提供了2-pyrone衍生物。该反应提供了一种直接且无过渡金属的方案,可以有效地构建2-吡喃酮骨架。建议一种可能的机理,涉及氯化氢的1,2-消除,氮杂-迈克尔加成,开环和分子内内酯化,以使目标2-吡喃酮衍生物的形成合理化。
A direct diastereoselective synthetic approach to useful cyclopropane α-amino acid was established via base-promoted [4 + 2] annulations between o-aminobenzaldehydes and alkyl 2-aroyl-1-chlorocyclopropanecarboxylates. The annulation reaction proceeded quickly under mildly basic conditions, affording α-aminocyclopropanecarboxylic acid derivatives in moderate to excellent yields with high diastereoselectivities
Highly regioselective tandem formal substitution and decarboxylation of 2-acyl-1-chlorocyclopropanecarboxylates with sodium sulfinates
作者:Yuequan Zhu、Yuefa Gong
DOI:10.1016/j.tet.2016.04.062
日期:2016.6
cyclopropene quickly combines with sodiumsulfinate via a regioselective 1,4-Michael addition. Subsequent esterolysis and decarboxylation of the 1,4-Michael adducts afforded 1-aroylsulfonyl-2-aroylcyclopropanes in high yields. This observation firstly demonstrates that direct Michael addition of sodiumsulfinates with reactive cyclopropene is really workable.
Construction of Substituted 2-Aminophenols via Formal [3 + 3] Cycloaddition of Alkyl 2-Aroyl-1-chlorocyclopropanecarboxylate with in Situ Generated Enamines
作者:Sen Yang、Dengfu Lu、Hengrui Huo、Fan Luo、Yuefa Gong
DOI:10.1021/acs.orglett.8b03090
日期:2018.11.2
A one-pot, three-component reaction between alkyl 1-chlorocyclopropanecarboxylate, alkyne diester, and amine is developed. This cascade reaction proceeds smoothly to afford substituted 2-aminophenols in high yields. The process proceeds through a formal [3 + 3] cycloaddition between an enamine and a cyclopropene intermediate formed in situ. The substituted 2-aminophenols can be transformed into phenoxazines
Synthesis of functionalized fulvenes: [3 + 2] annulation of ethyl α-chlorocyclopropaneformates with 1,3-dicarbonyl compounds
作者:Yuequan Zhu、Min Zhang、Hongling Yuan、Yuefa Gong
DOI:10.1039/c4ob01973c
日期:——
A base-promoted [3 + 2] annulation reaction of ethyl α-chlorocyclopropaneformates with 1,3-dicarbonylcompounds is described. This method provides an efficient and straightforward route to acidic multi-substituted fulvenes with distinctive properties.
Regioselective addition of phosphites to acyl cyclopropanes and following rearrangements: a facile access to enol phosphates
作者:Haotian Li、Yuequan Zhu、Dengfu Lu、Yuefa Gong
DOI:10.1039/c8ob01533c
日期:——
with organophosphites and acyl cyclopropane derivatives is developed and proved to provide an efficient access to functionalized enol phosphates. Unlike the well-known Perkow reaction, which employs trialkyl phosphite as the nucleophile, dialkyl phosphite is the key to the success of our transformation. This method is compatible with a series of dialkyl phosphites and acyl cyclopropanes possessing