Enantioselective Zinc/BINOL-Catalysed Alkynylation of Aldimines Generated in Situ from α-Amido Sulfones
作者:Gonzalo Blay、Ana Brines、Alicia Monleón、José R. Pedro
DOI:10.1002/chem.201102909
日期:2012.2.20
amines have been prepared by the addition of terminal alkynes to imines generated in situfrom α‐amido sulfones in the presence of diethylzinc and BINOL‐type ligands as catalysts. The reactions give good yields and high enantioselectivities (ee values up to 95 %) for a good number of aromatic and heteroaromatic α‐amido sulfones and alkynes.
Efficient Synthesis of 5-Chalcogenyl-1,3-oxazin-2-ones by Chalcogen-Mediated Yne-Carbamate Cyclisation: An Experimental and Theoretical Study
作者:Alicia Monleón、Gonzalo Blay、Luis R. Domingo、M. Carmen Muñoz、José R. Pedro
DOI:10.1002/ejoc.201403169
日期:2015.2
A very efficient synthesis of 5-chalcogenyl-1,3-oxazin-2-ones has been accomplished by the chalcogen-mediated yne–carbamate cyclisation of chiral, non-racemic N-Cbz-protected propargylic amines using PhXY (X = Se, S, Te; Y = Br or Cl) as electrophile sources. The reactions gave good-to-excellent yields for a wide range of substrates. In all cases the reaction was totally regioselective, occurring by