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O OEt MeO OMe OEt MeO OMe OH OEt MeO OMe O MeO OMe ...

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O<br />

<strong>MeO</strong><br />

<strong>OMe</strong><br />

<strong>OH</strong><br />

<strong>MeO</strong><br />

<strong>OMe</strong><br />

H<br />

<strong>OEt</strong><br />

1<br />

<strong>OEt</strong><br />

<strong>OH</strong> 2<br />

<strong>MeO</strong><br />

<strong>OMe</strong><br />

<strong>MeO</strong><br />

<strong>OMe</strong><br />

H 2 O<br />

<strong>OEt</strong><br />

<strong>OEt</strong><br />

<strong>MeO</strong> <strong>OMe</strong> <strong>MeO</strong> <strong>OMe</strong><br />

O<br />

O<br />

2<br />

SEt<br />

<strong>MeO</strong><br />

<strong>OMe</strong><br />

SEt<br />

<strong>MeO</strong><br />

<strong>OMe</strong><br />

HSEt<br />

SEt<br />

SEt<br />

<strong>MeO</strong><br />

<strong>OMe</strong><br />

SEt<br />

H<br />

<strong>MeO</strong><br />

<strong>OMe</strong><br />

H<br />

SEt<br />

SEt<br />

SEt<br />

<strong>MeO</strong><br />

<strong>OMe</strong><br />

H 2 O<br />

O<br />

<strong>MeO</strong><br />

<strong>OMe</strong><br />

A


<strong>MeO</strong><br />

<strong>OMe</strong><br />

O<br />

<strong>MeO</strong><br />

<strong>OMe</strong><br />

<strong>OH</strong><br />

<strong>MeO</strong><br />

<strong>OMe</strong><br />

<strong>OH</strong><br />

O<br />

<strong>MeO</strong><br />

<strong>OMe</strong><br />

O<br />

O<br />

S<br />

N<br />

N<br />

<strong>MeO</strong><br />

<strong>OMe</strong><br />

O<br />

O<br />

S<br />

N<br />

N<br />

<strong>MeO</strong><br />

<strong>OMe</strong><br />

O<br />

HO<br />

<strong>OH</strong><br />

O<br />

1 2<br />

3<br />

<strong>MeO</strong><br />

<strong>OMe</strong><br />

O<br />

<strong>OH</strong><br />

S<br />

N<br />

N<br />

4<br />

<strong>MeO</strong><br />

<strong>OMe</strong><br />

O<br />

<strong>OH</strong><br />

S<br />

N<br />

N<br />

5<br />

<strong>MeO</strong><br />

<strong>OMe</strong><br />

O<br />

O<br />

S<br />

N<br />

N<br />

SnBu 3<br />

<strong>MeO</strong><br />

<strong>OMe</strong><br />

O<br />

SnBu 3<br />

H<br />

A<br />

TM<br />

6


OMEM<br />

OTIPS<br />

O<br />

Br 2<br />

Br<br />

O<br />

MEM<br />

MEM<br />

OTIPS<br />

OTIPS<br />

Br<br />

O<br />

MEM<br />

TBAF<br />

Br<br />

O<br />

C 22 H 35 BrO 2 Si<br />

OTIPS<br />

O<br />

O<br />

O<br />

H 2<br />

O<br />

O<br />

TMSOTf<br />

Me 3 N<br />

O<br />

Ox<br />

O<br />

OTMS<br />

O

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