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11
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-
33745012661
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-
Among the many other complex natural products whose structures were elucidated by Professor Hirata and his co‐workers include the following: (a) aplysin
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(1963)
Tetrahedron
, vol.19
, pp. 1485
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Yamamura, S.1
Hirata, Y2
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24
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84989521714
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Tetrahedron Lett.
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(1972)
, pp. 1275
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-
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28
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84989524850
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Of course, alkaloid 10 actually has more than two stereocenters, but stereoisomerism is not possible at several of them for geometric reasons. For example, inversion of configuration at either of the carbons joined by the bold bond in Scheme 2 would lead to diastereomers far too strained for existence. Thus, for practical reasons, the relative configurations of these bridgehead atoms are interdependent.
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33
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0000080313
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Die Logik der chemischen Synthese: Vielstufige Synthesen komplexer „carbogener” Moleküle (Nobel-Vortrag)
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(1991)
Angewandte Chemie
, vol.103
, pp. 469
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Corey, E.J.1
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39
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1542447808
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(a) For recent discussions of the Lapworth and Evans formalisms, see
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(1988)
Tetrahedron
, vol.44
, pp. 503
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Klein, J.1
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44
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84989540497
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In the American southwest, where I was born and raised, this principle was recognized long ago in the folk saying that “it is always easier to ride a horse in the direction he wants to go.”
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59
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84989536439
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22 skeleton corresponding to methyl homosecodaphniphyllate is 12, 16‐cyclo‐1, 12‐secodaphnane.
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60
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0004114335
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Corey defines a “transform” as the “reverse of a synthetic reaction” and a “retron” of a given transform as “the enabling structural unit for that transform.” For example, the basic retron of a Diels‐Alder transform is a six‐membered ring with one double bond:, Wiley, New York
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(1989)
The Logic of Chemical Synthesis
, pp. 6
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Corey, E.J.1
Cheng, X.‐M.2
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61
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0000080313
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Die Logik der chemischen Synthese: Vielstufige Synthesen komplexer „carbogener” Moleküle (Nobel-Vortrag)
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(1991)
Angewandte Chemie
, vol.103
, pp. 469
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Corey, E.J.1
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67
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84989518295
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We thank Professor S. Yamamura (Keio University) for providing us with the comparison sample.
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70
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0042916927
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Das Prinzip der Äthylogie in der organischen Chemie
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(1957)
Experientia
, vol.13
, pp. 126
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Grob, C.A.1
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