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Handbook of Functionalized Organometallics Applications in S

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OEOM<br />

H<br />

144<br />

Ph<br />

SiMe 2Ph<br />

Et 2BH<br />

CH 2Cl 2<br />

25 ºC, 48 h<br />

1) 9-BBN-H<br />

2) i-Pr2Zn 7.2Methods <strong>of</strong> Preparation <strong>of</strong> Polyfunctional Organoz<strong>in</strong>c Reagents<br />

MeO<br />

Ph<br />

SiMe 2Ph<br />

147 148<br />

O Zni-Pr<br />

H<br />

H<br />

145<br />

Zni-Pr<br />

1) i-Pr2Zn 2) CuCN·2LiCl<br />

3) propionyl chloride<br />

59 %<br />

1) CuCN·2LiCl<br />

2) allyl bromide<br />

74 %<br />

1) CuCN·2LiCl<br />

2) Br Pr<br />

72 %<br />

1) CuCN·2LiCl<br />

2) EtCOCl<br />

77 %<br />

Scheme 7.45 Diastereoselective hydroboration and B/Zn-exchange.<br />

N<br />

Bn Ts<br />

OSiMe 2t-Bu<br />

1) 9-BBN-H<br />

2) i-Pr2Zn N<br />

Bn Ts<br />

150 151<br />

1) catecholborane<br />

Rh(PPh3) 3Cl cat.<br />

2) i-Pr2Zn 153 154<br />

Zni-Pr<br />

OSiMe 2t-Bu<br />

Zni-Pr<br />

1) CuCN·2LiCl<br />

2) propionyl chloride<br />

1) CuCN·2LiCl<br />

2) allylic bromide<br />

1) CuCN·2LiCl<br />

2) Br Pr<br />

Ph<br />

MeO<br />

SiMe 2Ph<br />

SiMe 2Ph<br />

O<br />

O<br />

H<br />

H<br />

146<br />

Ph<br />

Pr<br />

149b :dr=99:1<br />

Ph<br />

149a :dr=99:1<br />

SiMe 2Ph<br />

O<br />

Et<br />

149c :dr=99:1<br />

Bn<br />

N<br />

Ts<br />

152 :62%;d.r.=>96:96:96:

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