Convergent Total Syntheses of Callipeltosides A, B, and C
作者:James R. Frost、Colin M. Pearson、Thomas N. Snaddon、Richard A. Booth、Steven V. Ley
DOI:10.1002/anie.201204868
日期:2012.9.10
diastereoselective alkenylzinc addition allowing rapid access to the common aglycon. Attachment of each relevant L‐configured sugar resulted in the first total synthesis of callipeltoside B (see scheme), and the syntheses of callipeltosides A and C.
Applications of Crotonyldiisopinocampheylboranes in Synthesis: Total Synthesis of Restrictinol
作者:Anthony G. M. Barrett、Adrian J. Bennett、Stefan Menzer、Marie L. Smith、Andrew J. P. White、David J. Williams
DOI:10.1021/jo9815305
日期:1999.1.1
The total synthesis of restrictinol, the hydrolysis product of the antifungal natural product restricticin, starting from commercially available methyl (S)-(+)-3-hydroxy-2-methylpropionate is described. Key stages in the strategy involved (i) the use of Brown's allylboration chemistry to construct an acyclic intermediate bearing three of the four stereogenic centers of the natural product, (ii) formation
A highly convergent strategy towards rapamycin. Stereoselective construction of the C<sup>8</sup>–C<sup>18</sup>fragment
作者:A. D. Piscopio、N. Minowa、T. K. Chakraborty、K. Koide、P. Bertinato、K. C. Nicolaou
DOI:10.1039/c39930000617
日期:——
A strategy for a total synthesis of the immunosuppressant agent rapamycin 1 is outlined and the stereoselective construction of a suitably functionalized C8âC18 fragment 2 is described.
Synthetic studies on hemicalide, a recently isolated marine natural product displaying highly potent antiproliferative activity and a unique mode of action, have highlighted a reliable Horner–Wadsworth–Emmons olefination to create the C6–C7 alkene and a remarkable efficient Suzuki–Miyaura coupling to form the C15–C16 bond, resulting in the development of a convergentapproach toward the C1–C25 fragment
Palladium(0)‐Catalyzed
<i>Anti</i>
‐Selective Addition‐Cyclizations of Alkynyl Electrophiles
作者:Hirokazu Tsukamoto、Kazuya Ito、Tatsuhiko Ueno、Mitsugu Shiraishi、Yoshinori Kondo、Takayuki Doi
DOI:10.1002/chem.202203068
日期:2023.1.27
Palladium(0)/monophosphine complexes catalyze anti-selective arylative cyclizations of alkynyl electrophiles with organometallic reagents. Remarkably, the regioselectivity in the cyclization of conjugated diyne-aldehydes can be controlled by a choice of the phosphine ligand, with triphenylphosphine and tricyclohexylphosphine leading to the exclusive formation of 2-alkylidene-cyclopentanol and 2-cyclohexen-1-ol