3-Chloro-1-lithiopropene, a Functional Organolithium Reagent, and Its Reactions with Alkylboronates To Give 3-Alkylprop-1-en-3-ols
作者:Keith Smith、Mark C. Elliott、D. Heulyn Jones
DOI:10.1021/jo4018028
日期:2013.9.20
on oxidation give 3-alkylprop-1-en-3-ols in good yields. The reaction works for primary, secondary, benzylic, and even tertiary alkylboronic esters, providing allylic alcohols bearing almost any alkyl group available using organoborane chemistry and incorporating all features of such groups.
Factors Affecting Migration of Tertiary Alkyl Groups in Reactions of Alkylboronic Esters with Bromomethyllithium
作者:Mark C. Elliott、Keith Smith、D. Heulyn Jones、Ajaz Hussain、Basil A. Saleh
DOI:10.1021/jo4000459
日期:2013.4.5
be of great potential for the formation of quaternary carbon centers but often give poor yields/conversions. Calculations and experimental evidence show that tert-alkyl groups migrate less effectively than other types of alkylgroup in such reactions and that O-migration competes. Furthermore, slow/incomplete capture of the bromomethyl reagent by the boronic ester is a problem in more hindered systems
BROWN H. C.; PARK WON SUH; CHA JIN SOON; CHO BYUNG TAE; BROWN CH. A., J. ORG. CHEM., 51,(1986) N 3, 337-342
作者:BROWN H. C.、 PARK WON SUH、 CHA JIN SOON、 CHO BYUNG TAE、 BROWN CH. A.
DOI:——
日期:——
BROWN H. C.; SREBNIK M., ORGANOMETALLICS, 6,(1987) N 3, 629-631
作者:BROWN H. C.、 SREBNIK M.
DOI:——
日期:——
Migratory Aptitudes of Simple Alkyl Groups in the Anionotropic Rearrangement of Quaternary Chloromethyl Borate Species: A Combined Experimental and Theoretical Investigation
continuous model (PCM) method) has been considered. The following results are relevant: (a) in all cases, the reaction proceeds via a concerted-type mechanism which explains the retention of configuration at the migrating group and the inversion at the migration terminus experimentally observed. (b) The trend of the migration barriers along the direction primary --> secondary --> tertiary alkyl group