A simple catalytic method involving all‐metal aromatic frameworks as precatalysts ensures an efficient route to (Z)‐alkenes. Aromatic triangular palladium clusters were used to reduce internalalkynes without any trace of the formation of alkane side products. These trinuclear complexes provide a catalytic system that parallels the activity and selectivity of their best mononuclear peers, and the catalyst
New Strategic Reactions for Organic Synthesis: Catalytic Asymmetric C−H Activation α to Oxygen as a Surrogate to the Aldol Reaction
作者:Huw M. L. Davies、Rohan E. J. Beckwith、Evan G. Antoulinakis、Qihui Jin
DOI:10.1021/jo034533c
日期:2003.8.1
The C-H activation of silyl ethers by means of rhodium carbenoid-induced C-H insertion represents a very direct method for the stereoselective synthesis of silyl-protected beta-hydroxy esters. The reaction can proceed with very high regio-, diastereo-, and enantioselectivity and represents a surrogate to the aldol reaction. The reaction is catalyzed by the rhodium prolinate complex Rh(2)(S-DOSP)(4)
Convenient in situ generation of various dichlorinating agents from oxone and chloride: diastereoselective dichlorination of allylic and homoallylic alcohol derivatives
作者:Jingyun Ren、Rongbiao Tong
DOI:10.1039/c3ob40670a
日期:——
A safe and convenient protocol was developed for in situ generation of various dichlorinating agents (cf. Cl2, NCl3, Et4NCl3, ArICl2) from oxone and chloride. The synthetic utility of this protocol was demonstrated by diastereoselective dichlorination of a series of allylic and homoallylicalcohol derivatives with excellent yields and diastereoselectivity.
Total Synthesis of (+-)-Monomorine I and (+-)-Indolizidine 195B by an Aza-[2,3]-Wittig Rearrangement of a Vinylaziridine.
作者:Peter Somfai、Tomas Jarevång、Ulf M. Lindström、Anette Svensson、M. Hanfland、E. Dooryhee
DOI:10.3891/acta.chem.scand.51-1024
日期:——
A novel synthesis of (+/-)-monomorine I (1) and (+/-)-indolizidine 195B (2) is described in which the key step is the highly efficient aza-[2,3]-Wittigrearrangement of vinylaziridine 12 into tetrahydropyridine 13. Functional group manipulation then gave ketone 16 which could be converted into the target alkaloids by reductive amination (1:2 1.5:1).