The borrowing-hydrogen (or hydrogen autotransfer) process, where the catalyst dehydrogenates a substrate and formally transfers the H atom to an unsaturated intermediate, is an atom-efficient and environmentally benign transformation. Described here is an example of an asymmetric borrowing-hydrogen cascade for the formal anti-Markovnikov hydroamination of allyl alcohols to synthesize optically enriched
A Convenient and Versatile Method for the Preparation of α-Hydroxymethyl Ketone Derivatives from the Corresponding Allyl Silyl Ethers or Allyl Carboxylates
作者:Yung-Son Hon、Ying-Chieh Wong、Kuo-Jui Wu
DOI:10.1002/jccs.200800134
日期:2008.8
The ozonolysis of 1-substituted allyl silyl ethers or 1-substituted allyl carboxylates followed by treatment with bases gave the corresponding α-silyloxymethyl- or a-acyloxymethyl-ketones in good yields. It is proposed to proceed via the corresponding α-silyloxy- or α-acyloxyaldehydes intermediates followed by 1,4-group migration. The results of theoretical calculations are applicable to explain the
Fully selective intramolecular ortho photocycloaddition of 4-(4-methoxy-phenoxy)-3-(N3-benzoylthymin-1-yl)but-1- ene: an unprecedented benzene–thymine photocycloaddition
作者:Wim Saeyens、Roger Busson、Johan Van der Eycken、Piet Herdewijn、Denis De Keukeleire
DOI:10.1039/a700554g
日期:——
On irradiation of
4-(4-methoxyphenoxy)-3-(N
3
-benzoylthymin-1-yl)but-1-e
ne 1 at 254 nm in THF a single photoadduct 2 is formed as a result of
chemo-, regio- and stereo-selective intramolecular ortho
photocycloaddition of the thymine double bond to the 1,2-positions of the
phenyl ring.
Novel conversion of epoxides to one carbon homologated allylic alcohols by dimethylsulfonium methylide
作者:L. Alcaraz、J.J. Harnett、C. Mioskowski、J.P. Martel、T. Le Gall、Dong-Soo Shin、J.R. Falck
DOI:10.1016/s0040-4039(00)73522-2
日期:1994.7
The reaction of excess of dimethylsulfoniummethylide with terminal, allylic, or benzylic epoxides affords good to excellent yields of one carbon homologated allylic alcohols.