Stereoselective total synthesis of (+)-cryptocarya diacetate by an iterative Jacobsen’s hydrolytic kinetic resolution protocol
摘要:
A combination of iterative Jacobsen ' s hydrolytic kinetic resolution and reduction of a ketone for the construction of a 1,3-polyol moiety are key steps en route to a total synthesis of (+)-cryptocarya diacetate. (c) 2005 Elsevier Ltd. All rights reserved.
An efficient strategy for the synthesis of syn 1,3-diols via iterative acetate aldol reactions and synthesis of atorvastatin lactone
摘要:
An efficient strategy for the synthesis of syn 1,3-diol has been developed, employing an imidazolidinone based chiral auxiliary via stereoselective and sequential double acetate aldol reactions. The syn 1,3-diol subunit was modified to obtain the C-7 carboxylic acid side chain and further subjected to reaction with a suitable 1,4-diketone under Paal-Knorr conditions to obtain atorvastatin lactone. (C) 2015 Elsevier Ltd. All rights reserved.
Synthesis of the Griseusin B Framework via a One-Pot Annulation–Methylation–Double Deprotection–Spirocyclization Sequence
作者:Briar J. Naysmith、Margaret A. Brimble
DOI:10.1021/ol400686f
日期:2013.4.19
A highly convergent synthesis of the griseusin B scaffold is described. The key step involves an efficient one-pot Hauser–Kraus annulation–methylation–double deprotection–spirocyclization sequence that directly affords the target parent tetracyclic ringsystem.
Synthesis of highly substituted pyranonaphthalene spiroketals related to the griseusins using a Hauser–Kraus annulation strategy
作者:Briar J. Naysmith、Daniel Furkert、Margaret A. Brimble
DOI:10.1016/j.tet.2013.12.066
日期:2014.2
The synthesis of an advanced pyranonaphthalene spiroketal as an intermediate for the total synthesis of griseusin B is described. A one-pot Hauser–Kraus annulation–methylation via reaction of a highly-substituted enone with a cyanophthalide was employed to construct the naphthalene framework. Other key steps include Sharpless asymmetric dihydroxylation of a (Z)-alkene and an HF-pyridine mediated double
The totalsynthesis of 7,10‐epimer of the proposed structure of amphidinolide N was accomplished. The requisite chiral C17–C29 subunit was assembled stereoselectively via Keck allylation, Shi epoxidation, diastereoselective 1,3‐reduction, and a later oxidative synthesis of the THF framework. The C1–C13 and C17–C29 subunits were successfully coupled using a Enders RAMP “linchpin” as the C14–C16 three
Tetrahydropyran Synthesis by Intramolecular Conjugate Addition to Enones: Synthesis of the Clavosolide Tetrahydropyran Ring
作者:Roderick Bates、Ping Song
DOI:10.1055/s-0030-1257890
日期:2010.9
The synthesis of a tetrahydropyran intermediate for clavosolide A is reported, employing a combination of cross-metathesis and intramolecular oxa-Michael addition. The intramolecular oxa-Michael addition to α,β-unsaturated esters requires the use of strong bases and can result in either modest yields or stereoisomeric mixtures, and can be highly variable according to the substrate structure. In contrast
Total Synthesis of Icumazole A Using a Modified Cadiot–Chodkiewicz Coupling
作者:Jack Buntine、Samrat Dasgupta、Keely Dorney、Oscar Rubinstein、Mina Salimimarand、Jonathan M. White、Mark A. Rizzacasa
DOI:10.1021/acs.orglett.3c04268
日期:2024.2.9
stereotriad present in the oxazole moiety, an intramolecular Diels–Alder reaction to form the isochromanone, and an acetylide addition and selectivemethylation. The final steps involved a high-yielding modified Cadiot–Chodkiewicz coupling and stereoselectivereduction to secure the Z,Z-diene and afford 1.
首次报道了粘细菌代谢物艾克马唑 A ( 1 ) 的全合成。该路线的关键步骤包括有机催化的不对称自羟醛反应,随后进行乙酸羟醛反应以形成恶唑部分中的立体三联体,分子内狄尔斯-阿尔德反应以形成异色满酮,以及乙炔加成和选择性甲基化。最后的步骤涉及高产率修饰的 Cadiot-Chodkiewicz 偶联和立体选择性还原,以确保Z,Z -二烯并提供1 。