Synthetic Method to Form 2,2′-Bis(naphthoquinone) Compounds
作者:Vishwajeet Jha、Navneet Goyal、Cheryl K. Stevens、Edwin Stevens、Jayalakshmi Sridhar
DOI:10.1021/acs.joc.7b02501
日期:2017.12.15
We have discovered a transition-metal-free approach to the synthesis of 2,2′-bis(naphthoquinones) using a Diels–Alder reaction of conjugated ketene silyl acetals with benzoquinone. Its monomer analogue can also be synthesized by simply increasing the equivalents of benzoquinone.
Sliwa,H.; Maitte,P., Bulletin de la Societe Chimique de France, 1962, p. 369 - 374
作者:Sliwa,H.、Maitte,P.
DOI:——
日期:——
Cobalt‐Catalyzed Asymmetric 1,4‐Reduction of
<i>β,β‐</i>
Dialkyl
<i>α</i>
,
<i>β</i>
‐Unsaturated Esters with PMHS
作者:Dongpo Lu、Peng Lu、Zhan Lu
DOI:10.1002/ejoc.202100856
日期:2021.9.14
A cobalt-catalyzed asymmetric reduction of β,β-dialkyl α,β-unsaturatedesters with polymethylhydrosiloxane (PMHS) was reported to deliver the corresponding esters containing a chiral trialkyl carbon center at β-position with up to 97 % yield and 98 % ee. The chiral tridentate ligand oxazoline iminopyridine (OIP) could perform well for the asymmetric reduction instead of chiral bidentate ligands. This