A copper-catalyzed trifluoromethylation of benzene-linked 1,7-dienes with 1-trifluoromethyl-1,2-benziodoxole via a radical cascade cyclization process for the synthesis of mono- and bis-trifluoromethylated benzoxepines is developed. The selectivity depends on substituents on the double bond of the allyl group in 1,7-dienes. The large-scale operation and late-stage functionalization of bioactive molecules
Rhodium(III)-Catalyzed Dearomatizing (3 + 2) Annulation of 2-Alkenylphenols and Alkynes
作者:Andrés Seoane、Noelia Casanova、Noelia Quiñones、José L. Mascareñas、Moisés Gulías
DOI:10.1021/ja5034952
日期:2014.5.28
Appropriately substituted 2-alkenylphenols undergo a mild formal [3C+2C] cycloaddition with alkynes when treated with a Rh(III) catalyst and an oxidant. The reaction, which involves the cleavage of the terminal C-H bond of the alkenyl moiety and the dearomatization of the phenol ring, provides a versatile and efficient approach to highly appealing spirocyclic skeletons and occurs with high selectivity.
Cp*Co(III)-Catalyzed Annulations of 2-Alkenylphenols with CO: Mild Access to Coumarin Derivatives
作者:Xu-Ge Liu、Shang-Shi Zhang、Chun-Yong Jiang、Jia-Qiang Wu、Qingjiang Li、Honggen Wang
DOI:10.1021/acs.orglett.5b02728
日期:2015.11.6
Cp*Co(III)-catalyzed annulations of 2-alkenylphenols with CO for the synthesis of coumarin derivatives have been developed. The reaction features mild reaction conditions, broad substrate scope, and good functional group tolerance. Preliminary mechanistic studies were conducted, suggesting that C-H activation is the turnover limiting step. Furthermore, the efficiency of this reaction was demonstrated by the rapid total synthesis of three natural products herniarin, xanthyletin, and seselin.
Asymmetric Hydroesterification of Diarylmethyl Carbinols
An efficient asymmetric hydroesterfication of diarylmethyl carbinols is developed for the first time with a Pd‐WingPhos catalyst, resulting in a series of chiral 4‐aryl‐3,4‐dihydrocoumarins in excellent enantioselectivities and good yields. The method features mild reaction conditions, a broad substrate scope, use of easily accessible starting materials, and low palladium loadings. A plausible stereochemical
Palladium(II)-Catalyzed Direct Carboxylation of Alkenyl C–H Bonds with CO<sub>2</sub>
作者:Kota Sasano、Jun Takaya、Nobuharu Iwasawa
DOI:10.1021/ja405503y
日期:2013.7.31
Pd-catalyzed direct carboxylation of alkenyl C-H bonds with carbon dioxide was realized for the first time. Treatment of 2-hydroxystyrenes and a catalytic amount of Pd(OAc)2 with Cs2CO3 under atmospheric pressure of CO2 afforded corresponding coumarins in good yield. Furthermore, isolation of the key alkenylpalladium intermediate via C-H bond cleavage was achieved. The reaction was proposed to undergo
首次实现了 Pd 催化的烯基 CH 键与二氧化碳的直接羧化。在大气压 CO2 下用 Cs2CO3 处理 2-羟基苯乙烯和催化量的 Pd(OAc)2,以良好的收率得到相应的香豆素。此外,还实现了通过 CH 键断裂分离关键的烯基钯中间体。建议该反应进行烯基钯中间体与 CO2 的可逆亲核加成。