Iodine(V) Reagents in Organic Synthesis. Part 3. New Routes to Heterocyclic Compounds via <i>o</i>-Iodoxybenzoic Acid-Mediated Cyclizations: Generality, Scope, and Mechanism
作者:K. C. Nicolaou、P. S. Baran、Y.-L. Zhong、S. Barluenga、K. W. Hunt、R. Kranich、J. A. Vega
DOI:10.1021/ja012126h
日期:2002.3.1
The discovery and development of the o-iodoxybenzoic acid (IBX) reaction with certain unsaturated N-aryl amides (anilides) to form heterocycles are described. The application of the method to the synthesis of delta-lactams, cyclic urethanes, hydroxy amines, and amino sugars among other important building blocks and intermediates is detailed. In addition to the generality and scope of this cyclization
Total Synthesis of the Ansamycin Antibiotic (+)-Thiazinotrienomycin E
作者:Amos B. Smith、Zehong Wan
DOI:10.1021/jo991958j
日期:2000.6.1
first total synthesis of (+)-thiazinotrienomycin E (1), member of a novel class of cytotoxic ansamycin antibiotics, has been achieved. Key features of the synthetic strategy include (a) the efficient construction of sulfone 7 incorporating TBS protection of the aniline, (b) an improved synthesis of allyl chloride (-)-6, the advanced intermediate employed in our trienomycins A and F totalsyntheses, (c)
Conjunctive functionalization of vinyl boronate complexes with electrophiles: a diastereoselective three-component coupling
作者:Roly J. Armstrong、Christopher Sandford、Cristina García-Ruiz、Varinder K. Aggarwal
DOI:10.1039/c7cc01671a
日期:——
A conjunctive functionalization process enables a diastereoselective three-component coupling of vinyl boronate complexes with a range of electrophiles.
Treatment of (±)-4 with Pd(OAc)2, DPPP, TBAB and K2CO3 in toluene gave 16β in a highly stereoselective manner (17:1, 90%). Moreover, reaction of (±)-4 with Pd(OAc)2, (R)-Tol-BINAP and K2CO3 in toluene afforded 16β in 96% ee and in 20% yield.
在甲苯中用Pd(OAc)2,DPPP,TBAB和K 2 CO 3处理(±)-4时,立体选择性高(16:1,90 %),得到16β。而且,(±)-4与Pd(OAc)2,(R)-Tol-BINAP和K 2 CO 3在甲苯中的反应以96%ee和20%产率得到16β。
Catalytic Asymmetric Synthesis of Halenaquinone and Halenaquinol