bearing other substituents such as a bromine atom and alkenyl, succinimide, and carbonyl groups, were prepared, and their reactions with samariumdiiodide or tributylstannane were studied. The reactions of acyl silanes occurred in various manners such as reductions, reductive alkylations, intramolecular radical cyclizations, pinacol couplings, aldol reactions, and Tishchenko reactions, depending on the nature
Synthesis and glycosidase inhibitory activity of aminocyclitols with a C6- or a C7-ring
作者:Christine Gravier-Pelletier、William Maton、Thierry Dintinger、Charles Tellier、Yves Le Merrer
DOI:10.1016/j.tet.2003.09.049
日期:2003.10
The synthesis of carbasugars and various aminocyclitols, related to voglibose and acarbose used in the treatment of non-insulino-dependant diabetes, is described from C2-symmetrical bis-epoxides derived from d-mannitol. The methodology involves two key steps: a domino alkylation–cyclization with 2-lithio-1,3-dithiane derivatives, and reduction or reductive amination with a primary amine. These compounds
(+)-Rimocidin Synthetic Studies: Construction of the C(1−27) Aglycone Skeleton
作者:Amos B. Smith、Megan A. Foley、Shuzhi Dong、Alia Orbin
DOI:10.1021/jo900765p
日期:2009.8.21
Assembly of the C(1−27) macrocyclic skeleton of rimocidinolide, the aglycone of (+)-rimocidin (1), has been achieved in convergent fashion. Key features of the synthetic strategy entail application of multicomponent Type I Anion Relay Chemistry (ARC), in conjunction with the SN2/SN2′ reaction manifolds of vinyl epoxides, both employing 2-substituted 1,3-dithianes to construct the C(1−19) carbon backbone
雷莫西丁内酯((+)-雷莫西丁 ( 1 ) 的糖苷配基)的 C(1−27) 大环骨架的组装已以收敛方式实现。该合成策略的主要特点是应用多组分 I 型阴离子中继化学 (ARC),结合乙烯基环氧化物的S N 2/S N 2' 反应流形,两者均采用 2-取代 1,3-二噻烷来构建C(1−19) 碳主链。具有全反式三烯的 C(20−27) 硼酸乙烯基酯与先进的 C(1−19) 乙烯基碘化物的 Yamaguchi 结合,然后通过 Suzuki−Miyaura 交叉偶联进行大环化,完成了 C(1− 27)利莫西内酯骨架。
Synthesis and evaluation of a broad range of chiral sulfides for asymmetric sulfur ylide epoxidation of aldehydes
conformation and face selectivity was to be controlled through non-bonded steric interactions. Chirality was introduced from chiral pool materials (camphor, amino acids, lactic acid, limonene, carvone, glyceraldehyde), through enzyme mediated reduction/hydrolysis and through the use of chiral reagents (hydroboration). The sulfide catalysts were tested in the reaction between benzaldehyde tosylhydrazone salt
Spongistatin Synthetic Studies. An Efficient, Second-Generation Construction of an Advanced ABCD Intermediate
作者:Amos B. Smith、Victoria A. Doughty、Chris Sfouggatakis、Clay S. Bennett、Jyunichi Koyanagi、Makoto Takeuchi
DOI:10.1021/ol017273z
日期:2002.3.1
short, efficient, and stereocontrolled synthesis of (-)-4, an advanced ABCD subunit of the spongistatins, has been achieved. Central to the synthetic strategy is the multicomponent linchpin union of silyl dithianes with epoxides to access both the AB and CD fragments. Fragment coupling was then achieved via an efficient stereoselective aldol reaction. The linear sequence required 22 steps and proceeded