Divergent total synthesis of aspinolides B, E and J
作者:Caizhu Chang、Jialin Geng、Yuguo Du、Qingwei Lv、ZhiBing Dong、Jun Liu
DOI:10.1016/j.tet.2019.06.015
日期:2019.7
Stereoselective totalsynthesis of aspinolides B, E and J, naturally occurring 10-membered lactones, were accomplished by divergent strategies starting from the commercially available 2,3-O-isopropylidene-d-ribose and methyl d-lactate. The synthesis features rapid access to the both key fragments from chiral pool and the formation of 10-membered ring lactones containing trans double bond employing
Synthetic Studies towards Pectenotoxin-2: Synthesis of the Nonanomeric 10-epi-ABCDE Ring Segment by Kinetic Spiroketalization
作者:Jatta E. Aho、Antti Piisola、K. Syam Krishnan、Petri M. Pihko
DOI:10.1002/ejoc.201001411
日期:2011.3
The synthesis of the nonanomeric10-epi-ABCDEring system of pectenotoxin-2 has been achieved by using a kineticspiroketalization reaction. The synthesis of the spiroketalization precursor was achieved through a cross-metathesis/hydro-genation sequence. The formation of the epi-C10 isomer resulted from an unexpected anti-Felkin selective addition of organometallic nucleophiles to the advanced CDE
作者:Jun Liu、Yi Liu、Xing Zhang、Chaoli Zhang、Yangguang Gao、LinLin Wang、Yuguo Du
DOI:10.1021/jo301829p
日期:2012.11.2
orthodiffenes A and C, including their absolute stereochemistry. The key steps of our total synthesis involved cis-fused tetrahydrofuran cyclization, one-pot deprotection–lactonization, and intramolecularbenzoylmigration according to a biosynthetic hypothesis of orthodiffenes.
A combination of 1, 3-dipolar cycloaddition of Z-nitrone (2) to the chiral dipolarophile (3) and subsequent ring transformation of the resulting adducts (4 and 6) to piperidinol (17) has provided a new practical synthesis of 2, 3, 6-trisubstituted piperidine alkaloid, (+)-azimic acid (1).
All-in-One Synthesis of 3,6-Dideoxysugars: An Olefin Metathesis–Isomerization Approach
作者:Hongwei Chen、Zuming Lin、Yuan Meng、Jian Li、Sha-Hua Huang、Ran Hong
DOI:10.1021/acs.orglett.3c02449
日期:2023.9.1
known congeners, has been reported using commercially available methyl lactates in five steps. The essential tandem process involving the olefin cross-metathesis and isomerization steps was enabled by the dualfunction of Grubbs-II catalyst, affording the products in good yields and providing concise and practical access to a class of biologically important deoxysugars.