Gaining Insight Into Reactivity Differences Between Malonic Acid Half Thioesters (MAHT) and Malonic Acid Half Oxyesters (MAHO)
作者:Sean P. Bew、G. Richard Stephenson、Jacques Rouden、Jeremy Godemert、Haseena Seylani、Luis A. Martinez-Lozano
DOI:10.1002/chem.201605148
日期:2017.4.3
An efficient two‐step synthesis of structurally and functionally diverse thiophenol‐ and (cyclo)alkyl‐derived malonicacid half thioesters (MAHTs) and phenol‐derived malonicacid half oxyesters (MAHOs) has been achieved using cheap, readily available and easily handled starting materials. The synthesis of the MAHTs and MAHOs (the majority of which have not been previously reported) is readily scalable
Amine-Catalyzed Cascade Synthesis of 3,4-Diunsubstituted Coumarins
作者:Jia Wei、Pengcheng Wang、Qianfa Jia、Jiaoyao Huang、Zhiyun Du、Kun Zhang、Jian Wang
DOI:10.1002/ejoc.201300538
日期:2013.7
We disclose an efficient route to synthesize 3,4-diunsubstitutedcoumarins through a cascade organocatalytic reaction. The reaction is catalyzed by using of a combination of benzylamine (10 mol-%) and triethylamine (10 mol-%). Various salicylaldehydes were tested, and the corresponding coumarin products were obtained in good to high yields under mild and metal-free reaction conditions.
A highly enantioselective synthesis of chiral β-hydroxy thioesters that uses a decarboxylative aldol reaction of malonicacid half thioesters and aldehydes catalyzed by a chloramphenicol base-derived bifunctional organocatalyst is reported. The resulting chiral β-hydroxy thioesters were obtained in high yields (up to 82%) with good to excellent enantioselectivities (up to 94% ee). The synthetic application
An enantioselective cascade reaction between α,β-unsaturated aldehydes and malonic half-thioesters: a rapid access to chiral δ-lactones
作者:Qiao Ren、Shaofa Sun、Jiayao Huang、Wenjun Li、Minghu Wu、Haibing Guo、Jian Wang
DOI:10.1039/c4cc01736f
日期:——
Chiral saturated δ-lactones, ubiquitous bioactive O-heterocycles in nature, are readily prepared via a direct enantioselective decarboxylation of α,β-unsaturated carbonyls and malonic half-thioesters.
Bioinspired, Base- and Metal-Free, Mild Decarboxylative Aldol Activation of Malonic Acid Half Thioesters Under Phase-Transfer Reaction Conditions
作者:Sean P. Bew、G. Richard Stephenson、Jacques Rouden、Polly-Anna Ashford、Manuel Bourane、Agathe Charvet、Virginie M. D. Dalstein、Raphael Jauseau、G. D. Hiatt-Gipson、Luis A. Martinez-Lozano
DOI:10.1002/adsc.201400915
日期:2015.4.13
preliminary efforts at developing a unique base‐ and metal‐free phase‐transfer‐mediated malonic acid thioester (MAHT) ‘activation protocol’ that efficiently generates (±)‐β‐thioesters. Our bioinspired aldol process is exceptionally mild, conducted under near neutral pH reactionconditions, does not require an inert, oxygen‐free atmosphere or anhydrous reactionconditions and is highly atom‐economic. Exemplifying