69577-41-9Relevant academic research and scientific papers
Kinetic Resolution of Allylic Alcohol with Chiral BINOL-Based Alkoxides: A Combination of Experimental and Theoretical Studies
Liu, Yidong,Liu, Song,Li, Dongmei,Zhang, Nan,Peng, Lei,Ao, Jun,Song, Choong Eui,Lan, Yu,Yan, Hailong
supporting information, p. 1150 - 1159 (2019/01/11)
The development and characterization of enantioselective catalytic kinetic resolution of allylic alcohols through asymmetric isomerization with chiral BINOL derivatives-based alkoxides as bifunctional Br?nsted base catalysts were described in the study. A number of chiral BINOL derivatives-based alkoxides were synthesized, and their structure-enantioselectivity correlation study in asymmetric isomerization identified a promising chiral Br?nsted base catalyst, which afforded various chiral secondary allylic alcohols (ee up to 99%, S factor up to >200). In the mechanistic study, alkoxide species were identified as active species and the phenol group of BINOL largely affected the high reactivity and enantioselectivity via hydrogen bonding between the chiral Br?nsted base catalyst and substrates. The strategy is the first successful synthesis strategy of various chiral secondary allylic alcohols through enantioselective transition-metal-free base-catalyzed isomerization. The applicability of the strategy had been demonstrated by the synthesis of the bioactive natural product (+)-veraguensin.
Cross-coupling of dissimilar ketone enolates via enolonium species to afford non-symmetrical 1,4-diketones
Parida, Keshaba N.,Pathe, Gulab K.,Maksymenko, Shimon,Szpilman, Alex M.
, p. 992 - 997 (2019/12/23)
Due to their closely matched reactivity, the coupling of two dissimilar ketone enolates to form a 1,4-diketone remains a challenge in organic synthesis. We herein report that umpolung of a ketone trimethylsilyl enol ether (1 equiv) to form a discrete enol
Zinc-mediated chain extension reaction of 1,3-diketones to 1,4-diketones and diastereoselective synthesis of trans-1,2-disubstituted cyclopropanols
Xue, Song,Li, Le-Zhen,Liu, Yong-Kang,Guo, Qing-Xiang
, p. 215 - 218 (2007/10/03)
A variety of 1,3-diketones can be efficiently converted into the corresponding 1,4-diketones and trans-1,2-disubstituted cyclopropanols by using organozinc species in one-pot reactions. It was found that 2.3 equiv of CF 3CO2ZnCH2I was effective to give the corresponding chain-extended products in 44-85% yields, while a mixture of organozinc species formed from 4.0 equiv of Et2Zn, 2.0 equiv of CF3CO2H, and 4.0 equiv of CH2I2 resulted in the formation of trans-1,2-disubstituted cyclopropanols with quite good yields and diastereoselectivity.
One step preparation of 1,4-diketones from methyl ketones and α-bromomethyl ketones in the presence of ZnCl2·t-BuOH·Et2NR as a condensation agent
Nevar,Kel'in,Kulinkovich
, p. 1259 - 1262 (2007/10/03)
1,4-Diketones have been prepared in one step from methyl ketones and α-bromomethyl ketones under the action of ZnCl2·t-BuOH·Et2NR as a condensation agent with moderate to high yields. The mechanistic pathway of the reaction is proposed to go through aldol condensation of ketones followed by 1,3-dehydro-bromination of aldol products and cleavage of activated cyclopropyl intermediates.
