LEWIS ACID CATALYSED PINACOL REARRANGEMENT–A SHORT SYNTHESIS OF KARAHANAENONE
作者:Vidya Bhushan、Srinivasan Chandrasekaran
DOI:10.1246/cl.1982.1537
日期:1982.10.5
The pinacolic coupling reaction has been effectively used to prepare the unsymmetrical pinacol 2 and this key intermediate underwent a smooth ring enlargement to the monoterpene karahanaenone 3, an odoriferous constituent of Japanese hop and Cypress oil.
作者:Heinrich Becker、Marcos A. Soler、K. Barry Sharpless
DOI:10.1016/0040-4020(94)01021-q
日期:1995.1
The asymmetricdihydroxylation procedure (AD) is applied to a variety of polyenes. In many cases excellent regioselectivities are obtained. The observed selectivities are rationalized in terms of electronic and/or steric effects inherent to the substrate, superimposed on the substrate's favorable or unfavorable interactions with the binding pocket of the AD ligand. Surprisingly, for medium and large
Preparation of 2-exo-Hydroxy-7-oxabicyclo[2.2.1]heptanes
申请人:Shell Oil Company
公开号:US04487945A1
公开(公告)日:1984-12-11
2-exo-Hydroxy-7-oxabicyclo[2.2.1]heptanes are prepared by treating the corresponding cis-epoxycyclohexanol with acid in an inert solvent or by treating a 3-cyclohexen-1-ol which will produce the corresponding cis-epoxy alcohol successively or concurrently with an oxidizing agent and an acid in an inert solvent.
Compounds of the formula ##STR1## wherein X is (--CR.sub.4 R.sub.4 --).sub.m in which m is 0 or 1; Y is (--CR.sub.5 R.sub.6 --).sub.n in which n is 0, 1 or 2; Z is (--CR.sub.7 R.sub.7 --).sub.p in which p is 1, 2, or 3; the sum of m+n+p is an integer of 2 to 5, inclusive; R.sub.2 and R.sub.3 each is H or alkyl, and the like; R.sub.1 is H or alkyl; and W is an unsaturated moiety, are useful as plant growth regulators and herbicides.
Compounds of the formula ##STR1## wherein X is (--CR.sub.4 R.sub.4 --).sub.m in which m is 0 or 1; Y is (--CR.sub.5 R.sub.6 --).sub.n in which n is 0, 1 or 2; Z is (--CR.sub.7 R.sub.7 --).sub.p in which p is 1, 2 or 3; the sum of m+n+p is an integer of 2 to 5, inclusive; R.sub.2 and R.sub.3 each is H or alkyl, and the like; R.sub.1 is H or alkyl; and W is an unsaturated moiety, are useful as plant growth regulators and herbicides.