22255-17-0Relevant articles and documents
Reactivity of (Bicyclo[5.1.0]octadienyl)iron(1+) Cations: Application to the Synthesis of cis-2-(2′-Carboxycyclopropyl)glycines
Wallock, Nathaniel J.,Donaldson, William A.
, p. 2997 - 3007 (2007/10/03)
The addition of carbon and heteroatom nucleophiles to (bicyclo[5.1.0]octadienyl)Fe(CO)2L+ cations 5 or 8 (L = CO, PPh3) generally proceeds via attack at the dienyl terminus on the face of the ligand opposite to iron to generate 6-substituted (bicyclo[5.1.0]octa-2,4-diene)iron complexes (11 or 13). In certain cases, these products are unstable with respect to elimination of a proton and the nucleophilic substituent to afford (cyclooctatetraene)Fe(CO)2L (4 or 7). Decomplexation of 13f, arising from addition of phthalimide to 8, gave N-(bicyclo[5.1.0]octa-3,5-dien-2-yl)phthalimide (19). Oxidative cleavage of 19 (RuCl3/NaIO4) followed by esterification gave the cyclopropane diester 22, which upon hydrolysis gave cis-2-(2′ -carboxycyclopropyl)glycine (CCG-III, 18) (eight steps from 4, 43% overall yield). This methodology was also utilized for preparation of stereospecifically deuterated CCG-III (d-18) and optically enriched (-)-18. Deprotonation of 22 resulted in cyclopropane ring opening to afford the benzoindolizidine (23).
Facile synthesis of (2S,1'S,2'S)-2-(carboxycyclopropyl)glycine an isotype-selective agonist of metabotropic glutamate receptors
Ma, Dawei,Ma, Zhaochun
, p. 7599 - 7602 (2007/10/03)
(2S,1'S,2'S)-2-(Carboxycyclopropyl)glycine (L-CCG-I) was synthesized in 12 steps and 14% overall yield by using Sharpless's asymmetric dihydroxylation reaction and stereochemically controlled cyclopropanation as key steps.
Synthesis of Four Diastereomeric L-2-(Carboxycyclopropyl)glycines. Conformationally Constrained L-Glutamate Analogues
Shimamoto, Keiko,Ishida, Michiko,Shinozaki, Haruhikio,Ohfune, Yasufumi
, p. 4167 - 4176 (2007/10/02)
To determine what conformations of L-glutamate (L-Glu) activate that compound's different receptors in the mammalian central nervous system, four diastereochemically L-2-(carboxycyclopropyl)glycines, 1-4, which are conformationally constrained analogues o