An iron-catalyzed carbenoid insertion into C–H bonds of alkanes was developed with high activity (turnover numbers up to 690 in a gram-scale experiment) and chemoselectivity. This non-heme iron-catalyzed C(sp3)–H insertion reaction provides an efficient strategy for C–H functionalization.
The thionophosphate–thiolophosphate † photoisomerization proceeds predominantly through a non-chain radical pathway. Synthetically viable benzylation of tetrahydrofuran, propan-2-ol and olefins ‡
作者:Veejendra K. Yadav、Rengarajan Balamurugan、Masood Parvez、Raghav Yamdagni
DOI:10.1039/b003501g
日期:——
The photoirradiation of thionophosphates, ROP(S)(OEt)2, derived from benzyl and vinylogously benzyl alcohols in CH3CN, with a Hanovia medium-pressure mercury lamp in a quartz vessel leads to the formation of the corresponding thiolophosphates, RSP(O)(OEt)2, through a non-chain radical pathway. This behavior of thionophosphates is unlike that of the related phosphates, which react through ionic dissociationârecombination processes. When the irradiation is conducted in solvents such as PriOH, THF and toluene, benzylation of these solvents takes place in synthetically respectable yields. Irradiation of thionophosphates in CH3CN leads to a convenient allylic benzylation of olefins.
Highly enantioselective intermolecular carbene insertion to C–H and Si–H bonds catalyzed by a chiral iridium(iii) complex of a D4-symmetric Halterman porphyrin ligand
作者:Jing-Cui Wang、Zhen-Jiang Xu、Zhen Guo、Qing-Hai Deng、Cong-Ying Zhou、Xiao-Long Wan、Chi-Ming Che
DOI:10.1039/c2cc30441d
日期:——
The chiral iridium porphyrin [Ir((â)-D4-Por*)(Me)(EtOH)] displays excellent reactivity and stereoselectivity towards carbene insertion to CâH and SiâH bonds, affording corresponding products in high yields (up to 96%) and high enantioselectivities (up to 98% ee).
Diaryldiazoketones as Effective Carbene Sources for Highly Selective Rh(II)-Catalyzed Intermolecular C–H Functionalization
作者:Terrence-Thang H. Nguyen、Aaron T. Bosse、Duc Ly、Camila A. Suarez、Jiantao Fu、Kristin Shimabukuro、Djamaladdin G. Musaev、Huw M. L. Davies
DOI:10.1021/jacs.3c14552
日期:2024.3.27
A novel donor/acceptor carbene intermediate has been developed using diaryldiazoketones as carbene precursors. In the presence of the chiral dirhodium catalyst, Rh2(S-TPPTTL)4, diaryldiazoketones undergo highly regio-, stereo-, and diastereoselective C–Hfunctionalization of activated and unactivated secondary and tertiary C–H bonds. Computational studies revealed that the arylketo group behaves differently