Stereoselective Synthesis of (Z)-a-Phenoxymethylene-g-butyrolactone and Its Sulfur Analogues from 2-Propynyloxy- or 2-Propynylthiobenzene
摘要:
The preparations of (Z)-alpha -phenoxymethylene-gamma -butyrolactone, alpha -phenoxymethyl-gamma -butyrolactone, (Z)-alpha -phenylthiomethylene-gamma -butyrolactone, and alpha -phenylthiomethyl-gamma -butyrolactone derivatives from 2-propynyloxy-benzene and 2-propynylthiobenzene were described.
Stereoselective Synthesis of (Z)-a-Phenoxymethylene-g-butyrolactone and Its Sulfur Analogues from 2-Propynyloxy- or 2-Propynylthiobenzene
摘要:
The preparations of (Z)-alpha -phenoxymethylene-gamma -butyrolactone, alpha -phenoxymethyl-gamma -butyrolactone, (Z)-alpha -phenylthiomethylene-gamma -butyrolactone, and alpha -phenylthiomethyl-gamma -butyrolactone derivatives from 2-propynyloxy-benzene and 2-propynylthiobenzene were described.
Gold(III)‐Catalyzed Intermolecular Oxidation‐Cyclization of Ynones: Access to 4‐Substituted Chroman‐3‐ones
作者:Jian Li、Fang Yang、Yang‐Ting Ma、Kegong Ji
DOI:10.1002/adsc.201900260
日期:2019.4.23
A synthesis of 4‐substituted chroman‐3‐one derivatives has been developed through a gold(III) catalyzed oxidation‐cyclization of ynones in good to excellent yield using easily prepared substrates. A broad range of synthetically useful functional groups (halide, alkene, alkyne, phenolic hydroxyl) were tolerated. Further application of this method paves a new way to prepare the skeleton of oblarotenoids
A Boron–Oxygen Transborylation Strategy for a Catalytic Midland Reduction
作者:Kieran Nicholson、Joanne Dunne、Peter DaBell、Alexander Beaton Garcia、Andrew D. Bage、Jamie H. Docherty、Thomas A. Hunt、Thomas Langer、Stephen P. Thomas
DOI:10.1021/acscatal.0c05168
日期:2021.2.19
The enantioselective hydroboration of ketones is a textbook reaction requiring stoichiometric amounts of an enantioenriched borane, with the Midland reduction being a seminal example. Here, a turnover strategy for asymmetric catalysis, boron–oxygen transborylation, has been developed and used to transform the stoichiometric boranereagents of the Midland reduction into catalysts. This turnover strategy
222. The jaborandi alkaloids. Part I. The synthesis of homo- and isohomo-pilopic acids and of r-pilocarpidine and r-isopilocarpidine by new methods and the resolution of r-pilocarpine
作者:A. N. Dey
DOI:10.1039/jr9370001057
日期:——
PYRIDINO-, PYRROLIDINO- AND AZEPINO-SUBSTITUTED OXIMES USEFUL AS ANTI-ATHEROSCLEROSIS AND ANTI-HYPERCHOLESTEROLEMIC AGENTS