Nickel(II)-Catalyzed Synthesis of Sulfinates from Aryl and Heteroaryl Boronic Acids and the Sulfur Dioxide Surrogate DABSO
作者:Pui Kin Tony Lo、Yiding Chen、Michael C. Willis
DOI:10.1021/acscatal.9b04363
日期:2019.12.6
We report a redox-neutral Ni(II)-catalyzed sulfination of readily available aryl and heteroaryl boronicacids. Using the combination of commercially available, air-stable NiBr2·(glyme), a commercially available phenanthroline ligand, and DABSO, boronicacids are efficiently converted to the corresponding sulfinate salts, which can be further elaborated to valuable sulfonyl-containing groups, including
There are disclosed a composition comprising
(E)-1,4-dibromo-2-methyl-2-butene and
(Z)-1,4-dibromo-2-methyl-2-butene, wherein the ratio of the E isomer to the total amount of the E and Z isomers is 0.9 or more; a process for producing the same and a process using the same to produce an allyl halide compound of formula (1):
1
wherein X denotes a bromine atom,
Y denotes an ArS(O)
2
group or an RCOO group,
wherein Ar denotes an aryl group which may be substituted and R denotes a hydrogen atom, a lower alkyl group or an aryl group which may be substituted, and
the wavy line means that the derivative is a mixture of an E or Z geometrical isomer.
Process for producing a sulfone derivative of vitamin A alcohol
申请人:Hoffmann-La Roche Inc.
公开号:US03960967A1
公开(公告)日:1976-06-01
A process for the preparation of vitamin A and esters thereof from the condensation of a sulfone of 2-methyl-4-hydroxy-but-2-ene and an activated derivative of 3-methyl-5-(2,6,6-trimethyl-cyclohexen-1-yl)penta-2,4-diene including intermediates therein.
Synthesis of Vitamin A via Sulfones: A C15 Sulfone Route
作者:P. S. Manchand、M. Rosenberger、G. Saucy、P. A. Wehrli、H. Wong、L. Chambers、M. P. Ferro、W. Jackson
DOI:10.1002/hlca.19760590207
日期:1976.3.10
AbstractA Synthesis of vitamin A has been achieved by alkylating a β‐ionylidene‐ethyl (C15) aromatic sulfone with 1‐acetoxy‐3‐chlormethyl‐2‐butene (C5) followed by elimination of the corresponding sulfinic acid.
Horner, Leopold; Schmitt, Rolf-Erhard, Acta chemica Scandinavica. Series B: Organic chemistry and biochemistry, 1983, vol. 37, # 6, p. 469 - 474