1: 68 percent / Bu3SnH 2: 94 percent 3: TFA / CH2Cl2 4: 63 percent / NaIO4 5: NaBH4 6: 98 percent / HCl / dioxane / Heating View Scheme

<b>Multi-step reaction with 4 steps<br /> </b>1: 64 percent / CSA / also with TsOH<br />2: 1) LDA / 1) THF<br />3: MCPBA / CH₂Cl₂ <br />4: 58 percent / diethyl ether / 1.5 h / -78 &deg;C<br /> <br /> &nbsp;

<b>Multi-step reaction with 5 steps<br /> </b>1: B₂H₆ <br />2: 64 percent / CSA / also with TsOH<br />3: 1) LDA / 1) THF<br />4: MCPBA / CH₂Cl₂ <br />5: 58 percent / diethyl ether / 1.5 h / -78 &deg;C<br /> <br /> &nbsp;

<b>Multi-step reaction with 2 steps<br /> </b>1: MCPBA / CH₂Cl₂ <br />2: 58 percent / diethyl ether / 1.5 h / -78 &deg;C<br /> <br /> &nbsp;

<b>Multi-step reaction with 6 steps<br /> </b>2: B₂H₆ <br />3: 64 percent / CSA / also with TsOH<br />4: 1) LDA / 1) THF<br />5: MCPBA / CH₂Cl₂ <br />6: 58 percent / diethyl ether / 1.5 h / -78 &deg;C<br /> <br /> &nbsp;