Total synthesis of the proposed structure of iriomoteolide-1a
摘要:
Full details of the total synthesis of the proposed structure of iriomoteolide-1a (1) are described. The key steps include (i) a Sakurai reaction between allylsilane 11 and aldehyde 10 that bears both a tertiary chiral center and vinyl iodide moiety (ii) an anti-aldol reaction to construct the C18/C19 chiral centers (iii) a B-alkyl Suzuki-Miyaura coupling reaction to assemble the C7-C23 fragment, and (iv) a macrocyclic ring-closing metathesis to complete the construction of the target molecule. Two different approaches to access penultimate precursor 2 are delineated. The NMR spectra of the synthetic iriomoteolide-1a (1) were found not to match those reported for the natural product bringing into question its true structural identity. (C) 2011 Elsevier Ltd. All rights reserved.
Stereoselective synthesis of iriomoteolide-1a hemiketal core
作者:Jun Xie、David A. Horne
DOI:10.1016/j.tetlet.2009.05.092
日期:2009.8
A stereoselective synthesis of the cyclic hemiketal core of iriometeolide-1a (1) is described. The key step involves a Sakurai reaction of allylsilane 4 and aldehyde 5, which bears a chiral α-tertiary center. Mild TES deprotection of β,γ-unsaturated ketone 23 led to concomitant cyclization to produce the fully intact hemiketal core 2.
Total synthesis of the proposed structure of iriomoteolide-1a
作者:Jun Xie、Yuelong Ma、David A. Horne
DOI:10.1016/j.tet.2011.07.066
日期:2011.9
Full details of the total synthesis of the proposed structure of iriomoteolide-1a (1) are described. The key steps include (i) a Sakurai reaction between allylsilane 11 and aldehyde 10 that bears both a tertiary chiral center and vinyl iodide moiety (ii) an anti-aldol reaction to construct the C18/C19 chiral centers (iii) a B-alkyl Suzuki-Miyaura coupling reaction to assemble the C7-C23 fragment, and (iv) a macrocyclic ring-closing metathesis to complete the construction of the target molecule. Two different approaches to access penultimate precursor 2 are delineated. The NMR spectra of the synthetic iriomoteolide-1a (1) were found not to match those reported for the natural product bringing into question its true structural identity. (C) 2011 Elsevier Ltd. All rights reserved.
Studies toward the Synthesis of (−)-Zampanolide: Preparation of the Macrocyclic Core
作者:Dawn M. Troast、Jiayi Yuan、John A. Porco
DOI:10.1002/adsc.200800247
日期:2008.8.4
Studies towards the synthesis of the macrocycliccore of (-)-zampanolide are reported. The synthetic approach features a one-pot reduction/vinylogous aldol reaction for construction of the C15-C20 fragment, an intramolecular silyl-modified Sakurai (ISMS) reaction for construction of the 2,6-cis-disubstituted exo-methylene pyran subunit, and use of an sp2-sp3 Stille reaction for macrocyclization.