First asymmetric synthesis of (+)- and (−)-Roccellaric acid and dihydroprotolichesterinic acid
摘要:
Stereocontrolled syntheses of the title compounds from (R)-2,3-isopropylidene glyceraldehyde, (S)-O-THP-lactaldehyde and 1,2:5,6-Di-O-isopropylidene-alpha-D-glucofuranose (''diacetone-D-glucose'') are described.
Palladium-Catalyzed Asymmetric Allylic Alkylation of Cyclic Dienol Carbonates: Efficient Route to Enantioenriched γ-Butenolides Bearing an All-Carbon α-Quaternary Stereogenic Center
Allyl dienol carbonates (1) served as substrates for the title reaction to afford the furanones 2 in both high yields and high enantioselectivities. These furanones were eventually converted into valuable buildingblocks including γ‐tertiary and γ‐quaternary furanones (3) as well as β‐quaternary butyrolactones (4). This method was used as a key step in the totalsynthesis of (−)‐nephrosteranic acid
作者:Rakeshwar B. Chhor、Bernd Nosse、Sebastian Sörgel、Claudius Böhm、Michael Seitz、Oliver Reiser
DOI:10.1002/chem.200390019
日期:2003.1.3
development of a new method for the enantioselective synthesis of disubstituted gamma-butyrolactones is reported. Based on this strategy, the totalsynthesis of three paraconic acids, that is (-)-roccellaricacid, (-)-nephrosteranicacid and (-)-protopraesorediosic acid, and the formal totalsynthesis of (-)-methylenolactocin and (-)-protolichesterinic acid is described, which are important because of their
Free-Radical-Mediated Conjugate Additions. Enantioselective Synthesis of Butyrolactone Natural Products: (−)-Enterolactone, (−)-Arctigenin, (−)-Isoarctigenin, (−)-Nephrosteranic Acid, and (−)-Roccellaric Acid
作者:Mukund P. Sibi、Pingrong Liu、Jianguo Ji、Saumen Hajra、Jian-xie Chen
DOI:10.1021/jo015501x
日期:2002.3.1
alkylation furnished the natural products (-)-enterolactone, (-)-arctigenin, and (-)-isoarctigenin. The overall yields for the target natural products were 20-26% over six steps. Selective functionalization of the disubstituted succinates obtained by aldol condensation gave the paraconic acid natural products (-)-nephrosteranicacid (8) and (-)-roccellaricacid (9). The overall yield of the natural products
Catalytic Enantioselective Synthesis of Naturally Occurring Butenolides via <i>Hetero</i>-Allylic Alkylation and Ring Closing Metathesis
作者:Bin Mao、Koen Geurts、Martín Fañanás-Mastral、Anthoni W. van Zijl、Stephen P. Fletcher、Adriaan J. Minnaard、Ben L. Feringa
DOI:10.1021/ol102994q
日期:2011.3.4
An efficient catalytic asymmetric synthesis of chiral γ-butenolides was developed based on the hetero-allylic asymmetric alkylation (h-AAA) in combination with ring closing metathesis (RCM). The synthetic potential of the h-AAA-RCM protocol was illustrated with the facilesynthesis of (−)-whiskey lactone, (−)-cognac lactone, (−)-nephrosteranic acid, and (−)-roccellaric acid.
Total synthesis of (±)-Dihydroprotolichesterinic acid and Formal synthesis of (±)-Roccellaric acid by radical cyclisation of an epoxide. Using a transition-metal radical source
作者:Pijus Kumar Mandal、Subhas Chandra Roy
DOI:10.1016/s0040-4020(99)00635-3
日期:1999.9
A short and efficient total synthesis of (±)-Dihydroprotolichesterinic acid (1) and Formal synthesis of (±)-Roccellaric acid (2) has been acheived by radical cyclisation of epoxideusing a transition metal radical source.