Total synthesis of (-)-spirangien A, an antimitotic polyketide isolated from the myxobacterium Sorangium cellulosum.
Total synthesis of (-)-spirangien A, an antimitotic polyketide isolated from the myxobacterium Sorangium cellulosum.
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(-)-spirangien A 的全合成,这是一种从纤维素粘杆菌中分离出来的抗有丝分裂聚酮化合物。
DOI:
10.1002/asia.200800445
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发表时间:
2009
期刊:
影响因子:
--
通讯作者:
Paterson I
中科院分区:
文献类型:
--
作者:
Paterson I
A stereocontrolled total synthesisof the cytotoxic spiroacetal‐containing polyketide (−)‐spirangien A is described. This utilizes an aldol‐based strategy to construct a common stereotetrad intermediate that was elaborated into the spiroacetal core, followed by the introduction of the unstable pentaene‐containing side chain, performed with exclusion of light, using sequential Stille cross‐coupling reactions.An expedient first total synthesis of (−)‐spirangien A, a potent cytotoxic and antifungal polyketide of myxobacterial origin, is described. By using a common 1,3‐diol intermediate obtained by an efficient aldol‐reduction sequence for installation of the C15–C18 and C25–C28 stereotetrads and a reagent‐controlled boron aldol coupling followed by spiroacetalization, a highly convergent strategy was developed for construction of the elaborate spiroacetal core. Conversion of this advanced spiroacetal intermediate into (+)‐spirangien diene, obtained previously by controlled degradation of spirangien A, was then achieved by installation of the truncated side‐chain using an allylboration–Peterson sequence. The total synthesis of (−)‐spirangien A was then achieved by the controlled attachment of the unsaturated C1–C12 side‐chain, avoiding exposure to light. A Stork–Wittig olefination and double Stille cross‐coupling sequence was exploited to install the delicate conjugated pentaene chromophore featuring alternating (Z)‐ and (E)‐olefins, leading initially to the methyl ester of spirangien A, which proved significantly more stable than the corresponding free acid. Subsequent careful hydrolysis afforded (−)‐spirangien A, validating the relative and absolute configuration.
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DOI:
10.1021/jo701849x
发表时间:
2008
期刊:
The Journal of organic chemistry
影响因子:
--
作者:
R. Paton;J. Goodman
通讯作者:
J. Goodman
影响因子:
1.8
作者:
I. Paterson;J. Goodman;M. Isaka
通讯作者:
M. Isaka
影响因子:
5.2
作者:
Lorenz, Michael;Kalesse, Markus
通讯作者:
Kalesse, Markus
影响因子:
11.9
作者:
S. Wenzel;R. Müller
通讯作者:
S. Wenzel;R. Müller
影响因子:
3.6
作者:
ROUSH, WR;HOONG, LK;PARK, JC
通讯作者:
PARK, JC