Highly Stereoselective Synthesis of 1,3-Dienes through an Aryl to Vinyl 1,4-Palladium Migration/Heck Sequence
作者:Tian-Jiao Hu、Meng-Yao Li、Qian Zhao、Chen-Guo Feng、Guo-Qiang Lin
DOI:10.1002/anie.201801963
日期:2018.5.14
An efficient aryl to vinyl 1,4‐palladium migration/Heck sequence was developed for the stereoselectivesynthesis of 1,3‐dienes. High stereoselectivity was observed not only for 1,3‐dienes bearing two similar aryl groups at terminal positions, but also for those with configurations shown to be unfavorable with previous methods.
Asymmetric Alkenylation of Enones and Imines Enabled by A Highly Efficient Aryl to Vinyl 1,4-Rhodium Migration
作者:Shu-Sheng Zhang、Tian-Jiao Hu、Meng-Yao Li、Yi-Kang Song、Xiao-Di Yang、Chen-Guo Feng、Guo-Qiang Lin
DOI:10.1002/anie.201813585
日期:2019.3.11
The asymmetricrhodium‐catalyzed alkenylation of enones and imines with arylboronic acids has been developed. A highly controllable aryl to vinyl 1,4‐rhodium migration is the key step. Stereodefined vinyl moieties were installed in excellent enantioselectivies for most examined examples. DFT calculations reveal that the driving force of this rhodium migration is a kinetically favored process.
A Domino Palladium-Catalyzed Cyclization: One-Pot Synthesis of 4b-Alkyl-10-phenyl-4b,5-dihydroindeno[2,1-<i>a</i>]indenes via Carbopalladation Followed by C–H Activation
作者:Karu Ramesh、Gedu Satyanarayana
DOI:10.1021/acs.joc.7b00254
日期:2017.4.21
An effective domino one-pot [Pd]-catalysis for the construction of novel tetracyclic compounds was described. This process involved in the construction of three C–C bonds from simple and readily available 1-bromo-2-isopropenylbenzenes and internal alkynes. A variety of fused tetracyclic dihydroindeno-indenes were accomplished.
Borylation of Olefin C–H Bond via Aryl to Vinyl Palladium 1,4-Migration
作者:Tian-Jiao Hu、Ge Zhang、Ya-Heng Chen、Chen-Guo Feng、Guo-Qiang Lin
DOI:10.1021/jacs.5b11990
日期:2016.3.9
The aryl to vinyl palladium 1,4-migration was realized for the first time. The generated alkenyl palladium species was trapped by diboron reagents under Miyaura borylation conditions, providing a new method to synthesize β,β-disubstituted vinylboronates. The excellent regioselectivity and broad substrate scope were observed for this novel transformation.
Asymmetric hydrogenation of α-ethylstyrenes catalyzed by chiral ruthenium complexes
作者:Grant S Forman、Takeshi Ohkuma、William P Hems、Ryoji Noyori
DOI:10.1016/s0040-4039(00)01613-0
日期:2000.12
A combined system of RuCl2[(R,R)-Me-DuPhos](dmf)n and t-C4H9OK catalyzes the asymmetrichydrogenation of α-ethylstyrene derivatives. The reaction proceeds with a substrate to catalyst molar ratio of up to 2600 in 2-propanol at 8 atm and room temperature to give the chiral saturated products in 81–89% ee.
RuCl 2 [(R,R)-Me-DuPhos](dmf)n和t -C 4 H 9 OK的组合系统催化α-乙基苯乙烯衍生物的不对称氢化。反应在8 atm和室温下在2-丙醇中的底物与催化剂的摩尔比最高为2600,得到的手性饱和产物为ee的81-89%。