<scp>Pd‐Catalyzed</scp>
Asymmetric Synthesis of 3,
<scp>4‐Dihydroisoquinolinones</scp>
From
<scp>
<i>N</i>
‐Ts‐Benzamides
</scp>
and 1,
<scp>3‐Dienes</scp>
作者:Tae Kyun Kim、So Won Youn
DOI:10.1002/bkcs.12227
日期:2021.3
A Pd(II)‐catalyzed asymmetric oxidative annulation of N‐Ts‐benzamides with 1,3‐dienes using a chiral pyridine‐oxazoline‐type ligand for the regio‐ and stereoselective synthesis of chiral 3,4‐dihydroisoquinolinones has been developed.
Alkene synthesis: elimination of arenesulfinic acid from alkyl aryl sulfones using potassium trimethylsilanolate as base
作者:Charles A.G. Baker-Glenn、Anthony G.M. Barrett、Andrew A. Gray、Panayiotis A. Procopiou、Mark Ruston
DOI:10.1016/j.tetlet.2005.08.097
日期:2005.10
The use of potassium trimethylsilanolate as base to induce elimination of potassium arenesulfinate from alkylarylsulfones to produce E-alkenes is described. The reaction was appropriate for substrates containing a benzyl or allyl group α to the sulfone residue.
Transition metal-catalyzed dehydrogenation is a clean oxidation method requiring no additional oxidants. We have accomplished a heterogeneous Pd/C-catalyzed aqueous dehydrogenation of 1,4-cyclohexadienes and cyclohexenes to give the corresponding highly-functionalized arenes. Furthermore, various arenes could be efficiently constructed in a one-pot manner via a Diels–Alder reaction and the following
Iridium-Catalyzed Enantioselective Allyl–Allyl Cross-Coupling of Racemic Allylic Alcohols with Allylboronates
作者:Yu Zheng、Bei-Bei Yue、Kun Wei、Yu-Rong Yang
DOI:10.1021/acs.orglett.8b03627
日期:2018.12.21
catalytic system that allows asymmetric allyl–allylboronate cross-coupling with high enantioselectivity is reported. This transformation tolerates a large variety of racemic branched allylicalcohols and allylboronate substrates. The utility of the coupling is demonstrated in a concise catalytic asymmetric synthesis of (−)-preclamol.
Versatile C(sp<sup>2</sup>)−C(sp<sup>3</sup>) Ligand Couplings of Sulfoxides for the Enantioselective Synthesis of Diarylalkanes
作者:William M. Dean、Mindaugas Šiaučiulis、Thomas E. Storr、William Lewis、Robert A. Stockman
DOI:10.1002/anie.201602264
日期:2016.8.16
The reaction of chiral (hetero)aryl benzyl sulfoxides with Grignard reagents affords enantiomerically pure diarylalkanes in up to 98 % yield and greater than 99.5 % enantiomeric excess. This ligand coupling reaction is tolerant to multiple substitution patterns and provides access to diverse areas of chemical space in three operationally simple steps from commercially available reagents. This strategy