Origins of regio- and stereoselectivity in additions of phenylselenenyl chloride to allylic alcohols and the applicability of these additions to a simple 1,3-enone transposition sequence
Processes for preparing beta-hydroxy-ketones and alpha,beta-unsaturated ketones
申请人:Barnicki Donald Scott
公开号:US20050004401A1
公开(公告)日:2005-01-06
Processes for producing β-hydroxy-ketones and α,β-unsaturated ketones are disclosed which comprise the crossed condensation of an aldehyde with a ketone in the presence of a hydroxide or alkoxide of alkali metal or an alkaline earth metal as catalyst. The products of the process, β-hydroxy-ketones and α,β-unsaturated ketones, are useful for the preparation of many commercially important products in the chemical process industries including solvents, drug intermediates, flavors and fragrances, other specialty chemical intermediates.
The present invention relates to a method of enantioselective addition to enones, including: reacting R
3
(CH
2
)
p
CH═CR
5
C(═O)Y(CH
2
)
q
R
4
with R
6
ZnR
7
in the presence of a compound represented by the following formula (I) and a transition metal catalyst,
in which Y, p, q, R
1
, R
2
, R
3
, R
4
, R
5
, R
6
and R
7
are defined the same as the specification. Accordingly, the present invention can perform asymmetric conjugate addition in high yields and enantioselectivity.
A highly stereoselective and general synthesis of conjugated trans,trans-dienes and trans-alkyl ketones via hydroboration
作者:Ei-ichi Negishi、Takao Yoshida
DOI:10.1039/c39730000606
日期:——
A highly stereoselective (98–99%) and generalsynthesis of conjugated trans,trans-dienes and trans-alkenyl ketones involving a novel class of organoborane [1-chloroalk-1-enyl-(1,1,2-trimethylpropyl)boranes (1)] is reported.