Abstract
Our recently designed chiral bis-titanium(IV) catalyst can be successfully utilized
for the catalytic enantioselective hetero-Diels-Alder reaction of aldehyde and Danishefsky’s
diene. The high asymmetric induction is achievable in the case of sterically less
hindered aldehydes.
Key words
hetero-Diels-Alder - asymmetric synthesis - catalyst - titanium(IV) complex
References
<A NAME="RY03602ST-1A">1a </A>
Kii S.
Maruoka K.
Tetrahedron Lett.
2001,
42:
1935
<A NAME="RY03602ST-1B">1b </A>
Hanawa H.
Kii S.
Maruoka K.
Advanced Synth. Cat.
2001,
343:
57
Reviews:
<A NAME="RY03602ST-2A">2a </A>
Boger DL.
Weinreb SM.
Hetero Diels-Alder Methodology in Organic Synthesis
Academic Press Inc.;
San Diego California:
1987.
<A NAME="RY03602ST-2B">2b </A>
Jørgensen KA.
Angew. Chem., Int. Ed.
2000,
39:
3558
<A NAME="RY03602ST-2C">2c </A>
Jørgensen KA.
Johannsen M.
Yao S.
Audrain H.
Thorhauge J.
Acc. Chem. Res.
1999,
32:
605
<A NAME="RY03602ST-3A">3a </A>
Sellner H.
Karjalainen JK.
Seebach D.
Chem.-Eur. J.
1996,
7:
2873
<A NAME="RY03602ST-3B">3b </A>
Gong LZ.
Pu L.
Tetrahedron Lett.
2000,
41:
2327
<A NAME="RY03602ST-3C">3c </A>
Oi S.
Terada E.
Ohuchi K.
Kato T.
Tachibana Y.
Inoue Y.
J. Org. Chem.
1999,
64:
8660
<A NAME="RY03602ST-3D">3d </A>
Bercich MD.
Cambie RC.
Rutledge PS.
Aust. J. Chem.
1999,
52:
851
<A NAME="RY03602ST-3E">3e </A>
Yao S.
Roberson M.
Reichel F.
Hazell RG.
Jørgensen KA.
J. Org. Chem.
1999,
64:
6677
<A NAME="RY03602ST-3F">3f </A>
Jørgensen KA.
Johannsen M.
Yao SL.
Audrain H.
Thorhauge J.
Accounts Chem. Res.
1999,
32:
605
<A NAME="RY03602ST-3G">3g </A>
Thorhauge J.
Johannsen M.
Jørgensen KA.
Angew. Chem. Int. Ed.
1998,
37:
2404
<A NAME="RY03602ST-3H">3h </A>
Yao SL.
Johannsen M.
Audrain H.
Hazell RG.
Jørgensen KA.
J. Am. Chem. Soc.
1998,
120:
8599
<A NAME="RY03602ST-3I">3i </A>
Yao S.
Johannsen M.
Jørgensen KA.
J. Chem. Soc., Perkin Trans. 1
1997,
2345
<A NAME="RY03602ST-3J">3j </A>
Ghosh AK.
Mathivanan P.
Cappiello J.
Tetrahedron Lett.
1997,
38:
2427
<A NAME="RY03602ST-3K">3k </A>
Graven A.
Johannsen M.
Jørgensen KA.
Synlett
1997,
79
<A NAME="RY03602ST-3L">3l </A>
Hanamoto T.
Furuno H.
Sugimoto Y.
Inanaga J.
Chem. Commun.
1996,
20:
2373
<A NAME="RY03602ST-4">4 </A>
The hetero-Diels-Alder reaction of phenylpropargyl aldehyde 3 (R = C≡ CPh) proceeded smoothly with a chiral mono-Ti(IV) complex 2 (10 mol%) to give adduct 4 (R = C≡ CPh) in 47% yield. In contrast, however, the reactivity of the hetero-Diels-Alder
reaction of benzaldehyde 3 (R = Ph) are lowered (e.g., 29% yield) under similar reaction condition with a chiral mono-Ti(IV) 2 (10 mol%).
<A NAME="RY03602ST-5">5 </A> The absolute configuration of the aldol 5 was determined to be S by correlation to the authentic sample according to the literature:
Kobayashi S.
Uchiro H.
Fujishita Y.
Shiina I.
Mukaiyama T.
J. Am. Chem. Soc.
1991,
113:
4247
Reviews:
<A NAME="RY03602ST-6A">6a </A>
Carreira EM. In Comprehensive Asymmetric Catalysis
Vol. 3:
Jacobsen EN.
Pfaltz A.
Yamamoto H.
Springer;
Heidelberg:
1999.
p.998
<A NAME="RY03602ST-6B">6b </A>
Mahrwald R.
Chem. Rev.
1999,
99:
1095
<A NAME="RY03602ST-6C">6c </A>
Gröger H.
Vogl EM.
Shibasaki M.
Chem. Eur. J.
1998,
7:
1137
<A NAME="RY03602ST-6D">6d </A>
Nelson SG.
Tetrahedron: Asymmetry
1998,
9:
357
<A NAME="RY03602ST-6E">6e </A>
Bach T.
Angew. Chem. Int. Ed. Engl.
1994,
33:
417
<A NAME="RY03602ST-7">7 </A>
Schaus ES.
Brånalt J.
Jacobsen EN.
J. Org. Chem.
1998,
63:
403