已经证明了从 α、β-炔基酮和酯合成 β-羰基取代的叔醇的新策略。硅系链用于内部传递烷基,该烷基与 C-Si 到 CO 的转化相结合,可以在吸电子基团的 β 位以区域和非对映选择性“缝合”成对的 CC 和 CO 键。通过反式加成工艺的区域选择性炔烃氢化硅烷化提供了获得三取代乙烯基硅烷的清洁途径。随后的一锅氟化物诱导的 CC 键形成和所得叔硅烷(一种通常对此类条件不具有反应性的硅烷)的氧化提供所需的产物。相邻的酮和羧酸酯基团在促进这些高度受阻叔醇的氧化中的效用,证明了可能会影响取决于此类氧化的路线合成设计的观察结果。对于带有 γ-烷氧基立体中心的底物,观察到良好的非对映选择 (>10:1)。
Antiproliferative activity in HL60 cells by tetrasubstituted pyrroles: a structure–activity relationship study
摘要:
A number of tetrasubstituted pyrrole derivatives have been synthesized and evaluated for their in vitro antiproliferative activities using the human promyelocytic leukemia cell line HL60. Tetrasubstituted pyrroles are obtained by irradiation of a silica gel absorbed mixture of a conjugated alkynoate and a primary amine. Active compounds exhibited GI(50) values in the range 445 mu M, and only six products showed TGI values within the evaluation range. A structure-activity relationship is also discussed. (c) 2005 Elsevier Ltd. All rights reserved.
Alkyne Hydrosilylation Catalyzed by a Cationic Ruthenium Complex: Efficient and General Trans Addition
作者:Barry M. Trost、Zachary T. Ball
DOI:10.1021/ja0528580
日期:2005.12.1
The complex [Cp*Ru(MeCN)3]PF6 is shown to catalyze the hydrosilylation of a wide range of alkynes. Terminalalkynes afford access to alpha-vinylsilane products with good regioselectivity. Deuterium labeling studies indicate a clean trans addition process is at work. The same complex is active in internal alkyne hydrosilylation, where absolute selectivity for the trans addition process is maintained
Highly Enantioselective Catalytic Alkyl Propiolate Addition to Aliphatic Aldehydes
作者:Mark Turlington、Albert M. DeBerardinis、Lin Pu
DOI:10.1021/ol900667g
日期:2009.6.4
A novel H8BINOL-based chiral ligand (S)-3 is found to catalyze the alkyl propiolate addition to aliphatic aldehydes in the presence of ZnEt2 and Ti(OiPr)4 at room temperature with excellent enantioselectivity (89−97% ee).
发现一种新型的基于H 8 BINOL的手性配体(S)-3在室温下在ZnEt 2和Ti(O i Pr)4的存在下以优异的对映选择性(89-97%)催化丙酸烷基酯加成到脂肪族醛中ee)。
Base-Catalyzed Highly Stereoselective Conversion of γ-Hydroxy-α,β-acetylenic Esters to γ-Acetoxy Dienoates
作者:Yang Yue、Xiao-Qi Yu、Lin Pu
DOI:10.1002/chem.200802355
日期:2009.5.11
A convenient route with high stereo control to γ‐acetoxy dienoates is provided by the reaction of methyl propiolate with aldehydes in the presence of ZnEt2 and N‐methylimidazole at room temperature, followed by the catalytic conversion of the resulting γ‐hydroxy‐α,β‐acetylenic esters with p‐N,N‐dimethylaminopyridine (DMAP) in acetic anhydride (see scheme).
The conjugate addition of activated propargylic alcohols to alkyl propiolates is shown to be catalyst-dependent. Whereas trialkylamines catalyze the expected 1,4-adition of the alcohol on the alkynoate to give the β-alkoxyacrylate derivative, the trialkylphosphine-catalyzed reaction affords densely functionalized bicyclic hexahydrofuro[2,3-b]furan derivatives. A mechanistic proposal for the phosphine-catalyzed addition of alcohols to alkyl propiolates according with these observations is presented.
Highly enantioselective catalytic methyl propiolate addition to both aromatic and aliphatic aldehydes
作者:Jian Huang、Siping Wei、Li Wang、Chun Zhang、Shuangxun Li、Pingxian Liu、Xi Du、Qin Wang
DOI:10.1016/j.tetasy.2016.03.009
日期:2016.6
The excellent catalytic effect on methyl propiolate addition to a wide range of aromatic and aliphatic aldehydes promoted by inexpensive and commercially available BINOL-based ligand is reported. The catalyst systems showed high yields and excellent enantioselectivities for aromatic aldehydes, and excellent yields and high enantioselectivities for aliphatic aldehydes. (C) 2016 Elsevier Ltd. All rights reserved.