The trimethylgallium reagent was found to promote the addition of phenylacetylene to various aromatic and aliphatic aldehydes. This reaction was efficiently carried out in anhydrous CH2Cl2 at room temperature under mild conditions and the corresponding propargylic alcohols were obtained in good to excellent yields up to 98%.
NbCl5 mediated deprotection of methoxy methyl ether
作者:J.S. Yadav、B. Ganganna、Dinesh C. Bhunia、P. Srihari
DOI:10.1016/j.tetlet.2009.03.171
日期:2009.7
An efficient cleavage of methoxy methyl ether using NbCl5 is described. This protocol works efficiently with MOM ethers of alkyl, allyl, propargyl, benzyl alcohol and phenol derivatives. MOM esters are also found to be effectively cleaved under the present conditions.
3,3′-Functionalized octahydro-BINOL: a facile synthesis and its high enantioselectivity in the alkyne addition to aldehydes
作者:Lan Liu、Lin Pu
DOI:10.1016/j.tet.2004.05.049
日期:2004.8
A facilesynthesis of an enantiomerically pure 3,3′-bismorpholinylmethyl H8-BINOL ligand has been developed. This compound in combination with Et2Zn and Ti(OiPr)4 is found to catalyze the highly enantioselective reaction of phenylacetylene with aromatic aldehydes. The enantioselectivity of this catalytic process for the reactions of ortho-substituted benzaldehydes is significantly higher than that
已经开发了对映体纯的3,3'-双吗啉基甲基H 8 -BINOL配体的简便合成方法。发现该化合物与Et 2 Zn和Ti(O i Pr)4结合可催化苯基乙炔与芳族醛的高度对映选择性反应。该催化方法对邻位取代的苯甲醛的反应的对映选择性明显高于基于H 8 -BINOL的对映选择性。
Catalytic enantioselective addition of terminal alkynes to aromatic aldehydes using zinc-hydroxyamide complexes
作者:Gonzalo Blay、Luz Cardona、Isabel Fernández、Alícia Marco-Aleixandre、M. Carmen Muñoz、José R. Pedro
DOI:10.1039/b911592g
日期:——
A mandelamide ligand, derived from (S)-mandelic acid and (S)-phenylethanamine, catalyzes the addition of aryl-, alkyl- and silyl-alkynylzinc reagents to aromatic and heteroaromatic aldehydes with good yields and good to high enantioselectivities.
Abstract A practical synthesis of propargylic alcohols was developed by alkynylation of aldehydes mediated by zinc and allylbromide. Aromatic, aliphatic and vinyl aldehydes react with phenylacetylene or 1-hexyne to obtain various propargylic alcohols at room temperature in up to 98% yield. This method is characterized with inexpensive materials, wide substrate scope, and mild reaction conditions,